NOTE  Any question or answer that refers to iNaturalist also applies to any of the iNaturalist network platforms: ArgentiNat, BioDiversity4All, iNaturalist.ca, iNaturalist.LU, iNaturalist.Se, iNaturalistAU, iNaturalistCL, iNaturalistCR, iNaturalistEc, iNaturalistFi, iNaturalistGR, iNaturalistGT, iNaturalistil, iNaturalistNZ, iNaturalistPa, iNaturalistTW, iNaturalistUK, naturalista.mx, NaturalistaCO, NaturalistaUY, Natusfera   Key Dates   Q: City Nature Challenge 2025 important dates:   Q: When can I start making observations that will count for the City Nature Challenge? When should I stop?   Q: Can I upload photos during the CNC that I took prior to the CNC?   Q: I took so many photos during the CNC that there’s no way I can get them all uploaded before the end of the day on April 29 – what should I do?   Making Observations   Q: Do I need to join my city’s project and add my observations to it for them to be included?   Q: How can I make sure my observations are in my city’s CNC project?   Q: What if my city isn’t within the boundary of the project? Can I still participate?   Q: What kinds of observations should I make during the CNC?   Q: What if I make an observation of something I know isn’t wild? Will it still count for the CNC?   Q: What if I don’t know what the organism is that I took a picture of? How do my observations get identified?   Q: Do I have to make observations using the app? What if I want to use a real camera?   Q: What about if I see something but didn’t get a photo of it – can I still make an observation?   Q: Can I use the Seek app to make observations?   Q: Tips for Taking Photos During the City Nature Challenge   iNaturalist   Q: Someone added an ID to my observation – should I agree with it? What if I don’t agree with it?   Q: How do observations in iNaturalist become Research Grade? Do my observations have to get to Research Grade to count for the CNC?   Q: Can I help identify what people found during the CNC? What if I’m not an expert in anything?

The City Nature Challenge is a collaboration-meets-friendly-competition to see what can be accomplished when we all work toward a common goal of observing nature in urban settings. The big three results, highlighted here, are for the total number of observations, species, and people who participated, all around the world. Below, you will find the contributions of each city to these total numbers.   Loading...

Live Results

Join the 2025 City Nature Challenge!  Our list of participating cities and a link to our global project will be posted in March 2025.   Why participate?  There is nature all around us! Knowing what species are in our city and where they are helps us study and protect them, but the ONLY way to do that is by all of us – scientists, land managers, and the community – working together to find and document the nature in our area.  By participating in the City Nature Challenge, not only do you learn more about your local nature, but you can also make your city a better place – for you and other species!   Taking Part is Easy   It can be any WILD plant, animal, fungi, slime mold, or any other evidence of life found in your city. Take a picture or record the sound of what you find. Be sure to note the location of the critter or plant. Share your observations through iNaturalist or your city’s chosen platform. If it’s planted or taken care of by people it is not WILD. Mark it captive/cultivated!

Participate

Invented by community science staff, Lila Higgins at the Natural History Museum of Los Angeles County (NHM) and Alison Young and Rebecca Johnson at the California Academy of Sciences (CAS), the City Nature Challenge is an international effort for people to find and document plants and wildlife in cities across the globe. It’s a bioblitz-style competition where cities are in a friendly contest with each other to see who can make the most observations of nature, who can find the most species, and who can engage the most people.   How it all got started  Started in 2016 for the first-ever Citizen Science Day, the community science teams at NHM and California Academy of Sciences dreamed up the City Nature Challenge as a fun way to capitalize on their home cities’ friendly rivalry and hold an event around urban biodiversity. The first City Nature Challenge was an eight-day competition between Los Angeles and San Francisco, engaging residents and visitors in documenting nature to better understand urban biodiversity.     In its first year, over 20,000 observations were made by more than 1,000 people in a one-week period, cataloging approximately 1,600 species in each location, including new records for both areas. During the 2016 CNC, there was so much excitement and interest from people in other cities that the organizers knew they couldn’t keep the fun just to themselves. In 2017 the City Nature Challenge went national, and in 2018, the CNC became an international event!     City Nature Challenge Leadership     Lila Higgins (they/them)  Co-Senior Manager, Community Science and City Nature Challenge co-founder Natural History Museums of Los Angeles County  Lila, who joined the Natural History Museum of Los Angeles County in 2008, is an informal educator with almost two decades of experience in museum education and community science programming. Her fascination with nature started early; she grew up on a farm in the U.K. where she spent her time chasing butterflies, playing in hollow trees, and pretending to be a badger. Lila, was a lead educator on the Museum’s newest nature-themed exhibits—the Nature Lab and Nature Gardens. They also authored the book Wild L.A. and co-founded the global community science event called the City Nature Challenge. They hold a bachelor’s degree in entomology from UC Riverside and a master’s degree in environmental education from California State University, San Bernardino.     Rebecca Johnson (she/her)  Director, Center for Biodiversity and Community Science and City Nature Challenge co-founder California Academy of Sciences  Dr. Rebecca Johnson directs the Center for Biodiversity and Community Science and the Thriving California Initiative at the California Academy of Sciences. She and her team focus on designing equitable, inclusive, and meaningful events and campaigns to gather biodiversity data and mobilize those data to understand climate change and stem biodiversity loss in California. She is passionate about building partnerships and coalitions around place-based nature connection, biodiversity data use, and on-the-ground action for positive change. She co-founded the City Nature Challenge and Snapshot Cal Coast. Dr. Johnson is on the California Biodiversity Network Steering Committee and leads the Academy’s biodiversity work with the City of San Francisco. She is the board chair for Bay Nature Magazine and a TOGETHER Bay Area board member. Dr. Johnson earned her B.A. in Integrative Biology from the University of California, Berkeley, her M.A. in Systematics and Ecology from San Francisco State University, and her Ph.D. in Ecology and Evolutionary Biology from the University of California, Santa Cruz. She lives in San Francisco with her family.      Amy Jaecker-Jones (she/her)  Program Manager, Community Science Program and CNC Managing global organizers Natural History Museums of Los Angeles County  Amy joined the Community Science Program at the Natural History Museum of Los Angeles County in 2018. Her primary responsibility is coordinating the City Nature Challenge at the local and global levels. Other projects she has worked on include the Backyard Bat Survey, co-creating a bilingual pollinator guide with a local elementary school, and field-testing community science kits at several Los Angeles County parks. Amy is a California Naturalist, a Certified Interpretive Guide, and a graduate of Occidental College.     Sam Tayag (they/them)  Program Manager, Community Science Program and CNC Managing global organizers Natural History Museum of Los Angeles County    Sam joined the museum in 2021. Their roots in community science grow from field research with their Grandma as a child in the lahar fields of the Mt. Pinatubo volcanic eruption. There they saw the power of community knowledge and mutual aid with the land applied to scientific research. They work to support community relationships to the land and natural science as a California Naturalist, former nurse, community organizer, and . They center their family’s traditional Indigenous ways of learning and connecting, including their experience as a parent to an awesome young child.     Olivia VanDamme  Coordinator, Center for Biodiversity and Community Science and CNC Managing global organizers California Academy of Sciences    Olivia started at the California Academy of Sciences in 2019. She is a new member on the community science team, and excited to support City Nature Challenge! She previously supported Science Action Club, a community science based international STEM program providing out-of-school time programs with professional development and science kits. Olivia has been recognized by Justice Outside for her extraordinary leadership and commitment to diversity, equity and inclusion in nature, as an alumna of their Rising Leaders Fellowship program. She holds a BA in Geography and Latin American Studies from California State University, Chico. As a Latina surfer and dedicated ocean advocate, Olivia volunteers with Brown Girl Surf, was the previous Program Director for City Surf Project, and has worked on several environmental justice initiatives at government agencies such as the California Coastal Commission. She currently serves as an Advisory Board Member for the Explore the Coast grant program through the California State Coastal Conservancy.     Anabela Plos  CNC Spanish Language Global Organizer Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" MACN-CONICET  Anabela Plos has a PhD in Natural Sciences from the National University of La Plata, performs her duties at the "Bernardino Rivadavia" Argentine Museum of Natural Sciences as a member of the National Research Council Scientific and Technical (CONICET)  Since 2015, she has managed the Argentine node of the Global Biodiversity Information Facility (GBIF). Within the GBIF community, she served as Regional Representative of Latin American and Caribbean Nodes (2016-2021) and as a committee member of the Biodiversity Information for Development program for the Caribbean (BID), financed by the European Union, coordinated by GBIF. Anabela also coordinates and promotes activities related to open and participatory science, such as the City Nature Challenge, the Great Southern BioBlitz and various activities in the Wikimedia community in Argentina and the Latin American and Caribbean region.     Alison Young (she/her)  City Nature Challenge co-founder  Alison served as the Co-Director of the Center for Biodiversity and Community Science at the California Academy of Sciences, where she builds community and partnerships around nature and sharing knowledge about biodiversity, creates events and campaigns focused on documenting species, and brings this community-collected data to answer scientific questions and help inform decision-making. Alison also co-directed the Academy’s Thriving California strategic initiative, focused on scaling biodiversity science and education and collaborating with communities, other organizations, and the State to build a healthy, resilient future for people and nature in California. Alison’s background is in marine biology, she holds a Masters in Biology from Humboldt State University for research focused on the potential effects of climate change on California’s rocky intertidal communities, and a B.A. in Biology from Swarthmore College. When she’s not in the tidepools for work, she can often be found in the tidepools for fun – usually photographing nudibranchs, or in her local ceramics studio, happily bent over a pottery wheel, covered in clay.

About

2024    2024 Totals  2,436,844 Observations 65,682+ Species 83,528 Participants   CNC 2024 Map  

Past Results

This is the list of participating cities for the 2024 City Nature Challenge. While this list is updated regularly, it may not reflect any last minute changes to a city’s participation. Please click on the link to your city for any changes to events in your area.  If your city is not listed here, we welcome you to join our and take part wherever you live. Note: To participate in the global project you must first ‘join’ the project, using the link near the top right corner. For all other cities listed below, there is no need to join your local project, though you may choose to do so. All observations made within the boundaries of participating cities between April 26 - 29 will automatically be added.

Participating Cities

Welcome to the City Nature Challenge Education Toolkit!  We are currently updating our resources. In the meantime, we hope you will find these past activities for both formal and informal education settings useful.  While many of the activities are meant for groups, many can be adapted for use at home as well.  1  Read this educator guide for tips for facilitating, managing, and supporting student outdoor learning and exploration in schoolyards, nearby parks, or other green space. 2  Take a tour through iNaturalist, the website we will use in the U.S. to document observations. Learn how to best use this technology with students. This can be used in any formal or informal education setting. 3  View our “Educator Basecamp,” recommended progressions for short classroom and field activities for formal and informal settings. Progressions include activities, media, and other tools for the CNC, for a variety of ages and experience levels. See how they help to meet science standards and educational goals.   Education Basecamp Resources     Education Working Group Members:  Initial resources developed by the members of the City Nature Challenge 2018 Education Working Group.  Amy Lorenz, Encyclopedia of Life (Boston, MA) Anne Haywood, Mountain to Sea Education (Miami, FL) Benjamin Ong, The Rimba Project / University of Malaya (Kuala Lumpur, Malaysia) Catherine Hoffman, Cumberland River Compact / SciStarter (Nashville, TN) Emily Mortimer, Tulsa Regional STEM Alliance (Tulsa, OK) Erica Prange, Cleveland Museum of Natural History (Cleveland, OH) Katie Remine, Woodland Park Zoo (Seattle, WA) Kelly O’Donnell, CUNY Macaulay Honors College (New York City, NY) Marie Studer, Encyclopedia of Life (Boston, MA) Mary Lee Kennedy, Agents of Discovery (New York City, NY) Pam Eby, Omaha’s Henry Doorly Zoo & Aquarium (Omaha, NE) Paul Whisman, Natural History Museum of Utah (Salt Lake City, UT)

Education Toolkit

Research Papers  BioScience The city nature challenge: A global citizen science phenomenon contributing to biodiversity knowledge and informing local government practices  PeerJ Life & Environment A citizen science approach to evaluating US cities for biotic homogenization  Biodiversity A case study from the City Nature Challenge 2018: international comparison of participants’ responses to citizen science in action  UCL Discovery Evaluating public engagement with biological recording events - Case study of City Nature Challenge 2018  Biological Conservation COVID-19 pandemic drives changes in participation in citizen science project “City Nature Challenge” in Tokyo  ArXiv iNaturalist citizen science community during City Nature Challenge: new computational approach for analysis of user activity    Press and Media  Loading Docs Here the Wild Things Are City Projects: Auckland/Tāmaki Makaurau, Ōtautahi/Christchurch, Taranaki, Te Upoko o te ika/Wellington The San Diego Union-Tribune San Diego Natural History Museum plans biodiversity blitz City Project of San Diego Atlántida Ecocampus aúna a colectivos con objeto de conocer su fórmula para participar en la conservación de la biodiversidad City Project Bahia de Cadiz El Guadarramista ¿Te apuntas al City Nature Challenge 2018? City Project Madrid, Barcelona, Sevilla, Bahia de Cadiz EFE: Verde Cuatro ciudades españolas en el biomaratón para la observación de la naturaleza City Project Madrid La Vanguardia Biomaratón busca impulsar observación de naturaleza en 4 ciudades españolas City Project Madrid, Barcelona, Sevilla, Bahia de Cadiz South China Morning Post Conservation in Hong Kong: citizen scientists enlisted to record and safeguard city’s amazing biodiversity City Project Hong Kong am New York Forest Hills’ QueensWay teaches biodiversity, human impact to high school students City Project New York City Utah Public Radio Nature is Calling: Satisfy Your Curiosity And Contribute To Scientific Research Using iNaturalist City Project Wasatch Front (Salt Lake City) Voice of America Youngsters Help Scientists Study Nature in 16 US Cities City Project Los Angeles / All Cities Marin Independent Journal City Nature Challenge a fun way to become a naturalist City Project San Francisco / Los Angeles KCET Why is Citizen Science Important? City Project Los Angeles / San Francisco Los Angeles Times L.A. takes on San Francisco in the first City Nature Challenge City Project Los Angeles / San Francisco

Press & Publications

Want to find out more about the City Nature Challenge? Fill out the form below to contact the event’s co-organizers.  Name: Email: Subject Message: Submit

Contact Us

Are you interested in being a local organizer for the 2025 City Nature Challenge (CNC)? Anyone can be a CNC organizer! We’ve had local organizers that are from all walks of life—from high school students and retired people to staff from nature centers, museums, non-profit organizations, and local government officials.   Organizer Responsibilities  Organizers are responsible for:   Attending virtual and asynchronous meetingsWorking with other organizers in your area (if multiple people express interest and/or your city has returning organizers)Setting up a project in iNaturalist or your city’s preferred platformPromoting the CNC in your community     Getting Started As a Local Organizer  Whether you are a NEW or RETURNING Organizer, here are some easy steps to get started:  New Organizers   1. Subscribe to share your basic contact information with us. Please note that     subscribing to the email list does not commit you to organizing for the CNC,     you can unsubscribe at any point. We will share our official Commitment Form     to fill out after the informational and kickoff meetings (mandatory for all     new organizers).  2. Attend one virtual October New Organizer Informational Meeting or watch a     recording after sessions have concluded. Links to recordings will be sent to     those who have subscribed above. Organizer registration will remain open     until January 15, 2025.  3. Attend one virtual November CNC Kickoff Meeting or watch a recording after     meetings have concluded. Links to meeting registration or recordings (for     past events) will be sent to those who have subscribed above. Organizer     registration will remain open until January 15, 2025.  4. Fill out the Commitment to Organize form by December 13, 2024 (link can be     found in November CNC Kickoff Meeting agenda and recording).  5. Register your city by filling out the City Information form by January 15,     2025 (link can be found in November CNC Kickoff Meeting agenda and     recording).  6. Attend all future meetings (see timeline below). All meetings are mandatory     for new organizers. Watching the recording counts as attending a meeting.  Returning Organizers   1. Attend one virtual November CNC 2025 Kickoff Meeting (mandatory for all     returning organizers). Watching the recording counts as attending a meeting.     Check your email inbox and spam folders for registration details.  2. Attend the December and March Asynchronous Meetings and the June Debrief     Meeting (mandatory for all returning organizers). The January and April     Planning Meetings are optional for returning organizers.   3. Fill out the Commitment to Organize form (link to form will be shared during     the November Kickoff meeting).  4. Register your city by filling out the City Information form (link to form     will be shared during the November Kickoff meeting).  *Note about virtual (a.k.a Zoom) meetings: We have organizers all over the globe. To accommodate all the different time zones, we hold each meeting at four different times (three in English and one will be in Spanish). Organizers only need to attend one of the three meetings. All meeting times are shown in UTC (Coordinated Universal Time), and will be recorded so you can catch up if you miss them.  Ready to take the next step?  Subscribe to share your basic contact information with us.  Not ready yet? Read on for more information.   Early Bird registration closes December 13, 2024 and includes perks such as requesting a new CNC logo translation and submitting photos for possible inclusion in the CNC 2025 video.   Regular registration closes January 15, 2025.     City Nature Challenge 2025 Timeline  October 2024  New Organizer Informational Meetings (on Zoom in English October 9, 20:00 UTC and 23:00 UTC, October 10, 15:00 UTC / in Spanish October 11, 21:00 UTC. Mandatory attendance to one of four meetings for new organizers.  November 2024  CNC 2025 Kickoff Meetings (on Zoom in English November 6, 00:00 UTC, November 7,16:00 UTC and 21:00 UTC / in Spanish November 8, 21:00 UTC ). Mandatory attendance to one of four meetings for new and returning organizers.  December 2024  Attend the December All Organizer Asynchronous Planning Meeting (on Google Docs December 2-13). Attend iNaturalist How-to Training (in English December 10, 16:00 UTC / in Spanish December 13, 21:00 UTC). This training is for those organizers who are unfamiliar with making a City Nature Challenge project on iNaturalist or how to use the platform. Individual deadline for all organizers: fill out the CNC 2025 Commitment to Organize form by December 13 to remain on our mailing list for 2025.  We’ll share the link to the Commitment to Organize form during the November kickoff meeting, and via an organizer email.Early Bird registration for cities: one person from each city should fill out the City Information form by December 13 to receive perks associated with Early Bird registration. (The regular registration deadline is January 15 for all cities to participate in CNC 2025). We’ll share the link to the City Information form during the November kickoff meeting, and via an organizer email.  January 2025  Attend Makeup iNaturalist How-to Training (in English January 16, 16:00 UTC / in Spanish January 17, 21:00 UTC). This training is for those organizers who are unfamiliar with making a City Nature Challenge project on iNaturalist or how to use the platform. Note this is the EXACT SAME training as the one on December 10.Attend the January Organizer Planning Meetings (on Zoom in English January 28, 16:00 UTC, January 29, 21:00 UTC and 00:00 UTC / in Spanish January 31, 21:00 UTC). Mandatory for new organizers. Optional for returning organizers.City deadline: make your city’s project on iNaturalist or your city’s chosen platform by January 31.  February 2025  Official CNC 2025 City List posted on CNC website (February 28).  March 2025  Attend the March ALL Organizer Asynchronous Planning Meeting (on Google Docs March 3-19).  April 2025  Attend the April Organizer Planning Meetings (on Zoom in English April 16, 20:00 UTC and 23:00 UTC, April 17, 15:00 UTC / Spanish meeting date will be announced later). Mandatory for new organizers. Optional for returning organizers.CNC observation period starts (April 25)CNC observation period ends (April 28)CNC identification period (April 29 - May 4)  May 2025  Results announced (May 5)Dates for CNC 2026 announced (May 5)Fill out All Organizer Debrief Survey (May 5 - June 6)  June 2025  All Organizer Debrief Meeting (on Zoom in English only June 16, 15:00 UTC)   Organizer FAQ   How will we stay in touch?   How can I access the resources and information I will need as an organizer?   How many cities can I organize as a CNC local organizer?   What if I live in a rural area? / What counts as a “city?”   How can I tell if my city is already a CNC participant?   Do I have to use iNaturalist?  We’re always happy to answer more questions. Contact us .

CNC Local Organizer Information

Current Results

CNC at COP16  City Nature Challenge is heading to the meeting in Cali, Colombia. Lila Higgins & Rebecca Johnson (Co-Founders and Directors of the CNC), and Alison Young (CNC Co-Founder and Former Co-Director) will be attending the convening, to meet with partners, speak about impacts, and further education, research, and policy outcomes. We’ll be announcing the kickoff of next year’s challenge, CNC 2025, which is our ten year anniversary. We’re going to:   Bring the Globe Together for Biodiversity    City Nature Challenge participants in Bangkok, Thailand; La Paz, Bolivia; and Valle del Cauca, Colombia. Photos: Kawin Sirichantakul, Omar Torrico WCS, Fanny Ocampo     If you’re attending COP16, please join us for these events:   October 25, 14:00 - 15:00  Location: Place Quebec, Academia and Research Hub, Blue Zone  The City Nature Challenge: A Decade of Bringing People Together for Nature The City Nature Challenge is not only making a profound difference in increasing support for green and healthy cities by engaging people in documenting the plants and wildlife in their urban homes, it is the single largest annual source of urban biodiversity data. To date 690+ global cities and 364,000 people have collected over 7.13 million urban biodiversity observations over nine years. CNC organizers, participants, and the data they collect have an integral role to play in the development of local biodiversity strategies. Join us to discuss how we can build stronger connections between this global community science effort and the research and academia communities and collaborate on the important work of tracking changes in biodiversity and ultimately halting biodiversity loss.   October 26, 17:00 (Part of ‘Special Announcements’)  During the ICLEI 8th Summit on Subnational Governments and Cities, we will announce the kickoff of City Nature Challenge 2025, the ten year anniversary celebration, and partnership with ICLEI’s .    October 27, 16:30 - 17:30  Location: Place Quebec, Local Governments and Subnationals Hub, Blue Zone  City Nature Challenge: Connecting Community Science Urban Biodiversity Data with Local Governments The CNC is making a profound difference in increasing support for green and healthy cities by engaging people in documenting the plants and wildlife in their urban homes. To date 690+ global cities and 364,000 people have collected over 7.13 urban biodiversity observations. CNC organizers, participants, and the data they collect have the potential to connect with global processes, such as the development of local biodiversity strategies. Join us to discuss how we can build stronger connections between this global community science effort and cities/regions doing the important work of tracking changes in biodiversity and ultimately halting biodiversity loss.  If you’re unable to attend, follow along on our journey to Cali, Colombia on Instagram      Meeting Kunming-Montreal Global Biodiversity Framework (GBF) Targets  In 2022, after four years of negotiation and consultation, the (GBF) was adopted at the meeting in Montreal, Canada. The Framework put forth an ambitious plan to “reach the global vision of a world living in harmony with nature by 2050.” As part of the Framework, were created for urgent action, to be completed by 2030.    The City Nature Challenge works towards meeting targets 14, 20, 21, 22 and 23.   Target 14: Integrate biodiversity values into policy frameworks and planning processes.  CNC data is already being shared with local governments to influence policy and planning in local governments around the globe. See these examples below:   .The California Academy of Sciences is working with the California Department of Fish and Wildlife, the California Ocean Protection Council, and iNaturalist to share community-collected data, like those collected during CNC, to use in State decision-making tools.  Target 20: Build capacity for implementation.    CNC is a community of practice for the thousands of local organizers we work with and who are committed to engaging the hundreds of thousands of participants in collecting biodiversity data in their region. We build capacity with our local organizers so they can build their skills as organizers of large-scale biodiversity recording events, engage their local public in data collection, and become advocates with the public and with local governments around this work.   Two large-scale projects have grown out of the City Nature Challenge. Organizers we’ve worked with have gone on to develop , now in its fifth year, and the newly created .   Target 21: Ensure access to best available data, information, and knowledge.   CNC has engaged over 364,000 global community scientists in collecting more than 7.13 million biodiversity records over the past nine years.    Target 22: Ensure equitable and inclusive representation, including Indigenous peoples.    Our CNC organizers and participants are from all over the globe. In Fall of 2023,  we evaluated our CNC program and implemented measures to increase equity in our event. We have a small number of stipends available to local organizers whose work increases equity, diversity, accessibility, and inclusion in the CNC.Over half of the cities (406/690) involved in CNC 2024 were from the Global South/Majority.   Target 23: Ensure gender equality in implementing the framework.   Our Global Organizing team for the City Nature Challenge is totally comprised of women and non-binary people. Our CNC organizers and participants are from all over the globe. Data from our demographic survey of local organizers shows that in 2024 just over 58% of them are women. We work to support our organizers from historically excluded identities in STEM, so they can implement the challenge in their region.      To download, click .

Events

Started in 2016 as a competition between Los Angeles and San Francisco, the City Nature Challenge (CNC) has grown into an international event, motivating people around the world to find and document wildlife in their own cities. Run by the Community Science teams at the California Academy of Sciences and the Natural History Museum of Los Angeles County (NHM), the CNC is an annual four-day global bioblitz at the end of April, where cities are in a collaboration-meets-friendly-competition to see what can be accomplished when we all work toward a common goal.


Make observations of wildlife in your area for the City Nature Challenge.

Participants

Interested in organizing your city to participate in the 2025 CNC? Registration open until January 15, 2025. For more information, click below.

Cities

Join the City Nature Challenge!

Taking pictures of wild plants and animals.


April 25 – April 28, 2025

April 29 – May 4, 2025

It can be any plant, animal, or any evidence of life found in your city.

Find Wildlife

Take a picture of what you find. Be sure to note the location of the critter or plant.

Take picture

Share your observations through iNaturalist or your city's chosen platform.

Share!

Taking part is easy

Your participation makes an impact on understanding biodiversity and coexisting with nature. See the scientific research that has been made possible by City Nature Challenge participants like you!

City Nature Challenge Science

2024 Totals

Cities around the world collaborate to share observations of nature in the 2025 City Nature Challenge.
