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About

How it got Started

Started in 2016 for the first-ever Citizen Science Day, the citizen science teams at Natural History Museum of Los Angeles County 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 a citizen science 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. Over 20,000 observations were made by more than 1000 people in a one-week period, cataloging approximately 1600 species in each location, including new records for both areas. During the 2016 CNC, we heard so much excitement and interest from people in other cities that we decided we couldn’t keep to the fun just to ourselves. In 2017 the City Nature Challenge went national, and in 2018, the CNC became an international event!

Results of Participating Cities 2020

244 Cities Took Part

  • Adelaide, South Australia, Australia
  • Aguascalientes, Aguascalientes, México
  • Alachua County, Florida, USA
  • Albuquerque, New Mexico, USA
  • Alexandria, Virginia, USA
  • Amarillo, Texas, USA
  • Ann Arbor, Michigan, USA
  • Annapolis Valley, Nova Scotia, Canada
  • Asheville (Western NC), North Carolina, USA
  • Atlanta, Georgia, USA
  • Auckland, Auckland, New Zealand
  • Austin, Texas, USA
  • Azuero (Herrera), Panamá
  • Baltimore, Maryland, USA
  • Banyoles, Catalonia, Spain
  • Barcelona, Catalonia, Spain
  • Bedford, New York, USA
  • Birmingham & Black Country, Midlands, UK
  • Birminghham Metro Area, Alabama, USA
  • Blacksburg, Virginia, USA
  • Bocas del Toro, Panamá
  • Bolzano, South Tyrol, Italy
  • Boston Area, Massachusetts, USA
  • Brasília, Distrito Federal, Brazil
  • Brighton & Lewes Downs Biosphere, South East, United Kingdom
  • Bristol & Bath, United Kingdom
  • Brno, Jihomoravský kraj, Czech Republic
  • Cafayate, Salta, Argentina
  • Calgary Metropolitan Region (CMR), Alberta, Canada
  • Cali, Valle del Cauca, Colombia
  • Cape Breton Regional Municipality, Nova Scotia, Canada
  • Cape Town, Western Cape, South Africa
  • Carmen de Patagones, Buenos Aires, Argentina
  • Catania, Sicilia, Italy
  • Central Taiwan, Taichung, Taiwan
  • Charlotte Metro, North Carolina, USA
  • Charlottesville, Virginia, USA
  • Charlottetown (Urban PEI), Prince Edward Island, Canada
  • Chattanooga, Tennessee, USA
  • Chiayi, Chiayi, Taiwan
  • Chicago Metro, Illinois, USA
  • Cisternino, Puglia, Italy
  • Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina
  • Ciudad Victoria, Tamaulipas, México
  • Cleveland-Akron-Canton, Ohio, USA
  • Cocle, Panamá
  • Colmenar Viejo, Madrid, Spain
  • Colon, Panamá
  • Colorado Springs, Colorado, USA
  • Concepción del Uruguay, Entre Ríos, Argentina
  • Constantine, Constantine, Algeria
  • Copenhagen, Copenhagen, Denmark
  • Copertino, Puglia, Italy
  • Córdoba, Córdoba, Argentina
  • Cuautitlán Izcalli, Estado de México, México
  • Curitiba, Paraná, Brazil
  • Dallas/Fort Worth (DFW), Texas, USA
  • Darien, Panamá
  • Davao City, Davao del Sur, Philippines
  • David City, Chiriquí, Panamá
  • Denver-Boulder Metro Area, Colorado, USA
  • Dorila, La Pampa, Argentina
  • Durban, KwaZulu-Natal, South Africa
  • El Paso, Texas, USA
  • El Salvador, El Salvador
  • Eldorado, Misiones, Argentina
  • Ensenada, Baja California, México
  • Eugene/Springfield, Oregon, USA
  • Fairfield County, Connecticut, USA
  • Fort Wayne, Indiana, USA
  • Fukutsu, Fukuoka, Japan
  • Gaborone, South East, Botswana
  • Gálvez, Santa Fé, Argentina
  • Garden Route, Western Cape, South Africa
  • Geelong, Victoria, Australia
  • General Villegas, Buenos Aires, Argentina
  • Gero, Gifu, Japan
  • Glasgow, Glasgow, United Kingdom
  • Gran Área Metropolitana, San José-GAM, Costa Rica
  • Graz, Styria, Austria
  • Greater Kansas City Metro Area, Missouri and Kansas, USA
  • Greater Manchester, North West, United Kingdom
  • Greater Philadelphia Area, Pennsylvania, USA
  • Greater Richmond Region, Virginia, USA
  • Greater Saint John, New Brunswick, Canada
  • GTM Research Reserve Watershed, Florida, USA
  • Guadalajara, Jalisco, México
  • Gualeguaychú, Entre Ríos, Argentina
  • Guanajuato, Guanajuato, México
  • Guayaquil, Guayas, Ecuador
  • Guimarães, Braga, Portugal
  • Halifax Regional Municipality (HRM), Nova Scotia, Canada
  • Honduras, Honduras
  • Hong Kong SAR, Hong Kong SAR, China
  • Houston-Galveston, Texas, USA
  • Indianapolis, Indiana, USA
  • Inland Empire, California, USA
  • Iskandar, Johor, Malaysia
  • Jastrebarsko, Zagrebačka županija, Croatia
  • Johnson City/Washington County, Tennessee, USA
  • Jonesboro, Arkansas, USA
  • Kaohsiung, Kaohsiung, Taiwan
  • Karlovac, Karlovačka županija, Croatia
  • Kisumu, Kenya
  • Kitsap County, Washington, USA
  • Knox County, Tennessee, USA
  • Krems + Wachau, Lower Austria, Austria
  • Kursk, Kursk, Russia
  • La Paz/El Alto, La Paz, Bolivia
  • La Plata, Buenos Aires, Argentina
  • Lancashire, North West, United Kingdom
  • Lawrence, Kansas, USA
  • Lecce, Puglia, Italy
  • Lincoln, Nebraska, USA
  • Lisbon, Portugal
  • Liverpool City Region, North West, United Kingdom
  • Logan, Utah, USA
  • Loja, Loja, Ecuador
  • London, London, United Kingdom
  • Los Angeles County, California, USA
  • Lower Rio Grande Valley, Texas, USA
  • Luquilo, Puerto Rico, USA
  • Luxembourg, Luxembourg, Luxembourg
  • Lviv, Lvivska, Ukraine
  • Maastricht, Limburg, Netherlands
  • Macao SAR, Macao SAR, China
  • Madrid, Madrid, Spain
  • Mahoning River Valley, Ohio, USA
  • Managua, Managua, Nicaragua
  • Manaus, Amazonas, Brazil
  • Manhattan, Kansas, USA
  • Manta, Manabi, Ecuador
  • Mar del Plata, Buenos Aires, Argentina
  • Massa Lubrense, Campania, Italy
  • Maui, Hawaii, USA
  • Mendocino County, California, USA
  • Mendoza, Mendoza, Argentina
  • Minneapolis-St. Paul, Minnesota, USA
  • Mombasa, Kenya
  • Montecarlo, Misiones, Argentina
  • Monterrey Zona Metropolitana, Nuevo Leon, México
  • Montréal, Québec, Canada
  • Morelia, Michoacán, México
  • Moscow, Moscow, Russia
  • Mustang Island, Texas, USA
  • Nairobi, Kenya
  • Nanning, Guangxi, China
  • Napoli, Campania, Italy
  • Narok, Kenya
  • Nashville, Tennessee, USA
  • Nelson Mandela Bay, Eastern Cape, South Africa
  • New Orleans, Louisiana, USA
  • New York City, New York, USA
  • North East England, North East, United Kingdom
  • North Taiwan, Taipei, Taiwan
  • Northern Colorado, Colorado, USA
  • Nottingham City, Midlands, United Kingdom
  • Oahu, Hawaii, USA
  • Omaha Metro, Nebraska, USA
  • Orange County, California, USA
  • Ostuni, Puglia, Italy
  • Ōtautahi/Christchurch, Canterbury, New Zealand
  • Ōtepoti/Dunedin, Otago, New Zealand
  • Ottawa-Gatineau (NCR), Ontario/Québec, Canada
  • Palermo, Sicilia, Italy
  • Panamá, Panamá, Panamá
  • Paso de Ovejas, Veracruz, México
  • Pereira, Risaralda, Colombia
  • Perú, Perú
  • Pioneer Valley, Massachusetts, USA
  • Pittsburgh Region, Pennsylvania, USA
  • Playa del Carmen-Tulum- Puerto Morelos (Riviera Maya), Quintana Roo, México
  • Port Harcourt/Eagle Island, River State, Nigeria
  • Posadas, Misiones, Argentina
  • Prague, Czech Republic
  • Puebla, Puebla, México
  • Puerto Iguazú, Misiones, Argentina
  • Querétaro, Querétaro, México
  • Redlands City, Queensland, Australia
  • Riberalta, Vaca Diez/Beni, Bolivia
  • Richmond, British Columbia, Canada
  • Rio Branco, Brazil
  • Río Grande, Tierra del Fuego, Antártida e Islas del Atlántico Sur, Argentina
  • Rochester, New York, USA
  • Rock River Valley (Rockford), Illinois, USA
  • Rosario, Santa Fé, Argentina
  • Sacramento, California, USA
  • Salta, Salta, Argentina
  • San Antonio de Areco, Buenos Aires, Argentina
  • San Antonio, Texas, USA
  • San Carlos de Bariloche, Río Negro, Argentina
  • San Cristóbal de las Casas, Chiapas, México
  • San Diego County, California, USA
  • San Francisco Bay Area, California, USA
  • San Francisco de Macoris, Duarte, Republica Dominicana
  • San Luis Potosí, San Luis Potosí, México
  • San Miguel de Tucumán, Tucumán, Argentina
  • San Pedro Pochutla, Oaxaca, México
  • Santa Cruz de la Sierra, Santa Cruz, Bolivia
  • Santo Domingo, Santo Domingo, Republica Dominicana
  • São Paulo, Brazil
  • Savannah, Georgia, USA
  • Seattle-Tacoma Metropolitan Area, Washington, USA
  • Sevastopol, Sevastopol, Russia
  • South Bend (Michiana), Indiana, USA
  • South Florida, Florida, USA
  • Southeastern Coastal NC, North Carolina, USA
  • Southwest Louisiana, Louisiana, USA
  • Spartanburg County, South Carolina, USA
  • St. Louis Metro Area, Missouri and Illinois, USA
  • Sucre, Chuquisaca, Bolivia
  • Surrey, BC/Metro Vancouver, Canada
  • Sydney (Greater Sydney Area), New South Wales , Australia
  • Tainan City, Tainan, Taiwan
  • Tandil, Buenos Aires, Argentina
  • Taoyuan-Hsinchu, Hsinchu, Taiwan
  • Taranto, Puglia, Italy
  • Tepic, Nayarit, México
  • Teton Communities, Wyoming and Idaho, USA
  • The Hague, Netherlands
  • The Wasatch, Utah, USA
  • Tijuana, Baja California, México
  • Tlaxco, Tlaxcala, México
  • Tokyo, Tokyo, Japan
  • Tolhuin, Tierra del Fuego, Antártida e Islas del Atlántico Sur, Argentina
  • Toluca, Estado de México, México
  • Torreon (Comarca Lagunera), Coahuila, México
  • Trento, Trentino Alto Adige, Italy
  • Triangle Area, North Carolina, USA
  • Trieste, Friuli-Venezia Giulia, Italy
  • Trinitapoli, Puglia, Italy
  • Tshwane, Gauteng, South Africa
  • Tulsa Metro Area, Oklahoma, USA
  • Tuxpan, Veracruz, México
  • Ushuaia, Tierra del Fuego, Antártida e Islas del Atlántico Sur, Argentina
  • Veraguas, Panamá
  • Vienna, Vienna, Austria
  • Washington, D.C. Metro Area, USA
  • West Panamá, Panamá
  • Westmorland County, New Brunswick, Canada
  • Wilmington, Delaware, USA
  • Zagreb, Grad Zagreb, Croatia
  • Zihuatanejo de Azueta, Guerrero, México
  • Zona Metropolitana Veracruz, Veracruz, México

41K

More than 41,000 people participated

815K

Over 815,000 observations were made

32K

32,000+ species were found

1300+

1,300+ rare / endangered / threatened species documented!

Due to the COVID-19 pandemic, the 2020 City Nature Challenge was a collaborative event in which results were not ranked by city. For a complete list of each city’s contribution to the total number of observations, species, and people see the 2020 Collective Results page.

Results of Participating Cities 2019

159 Cities Took Part

  • Albuquerque, New Mexico, USA
  • Alexandria, Virginia, USA
  • Amarillo, Texas, USA
  • Angel R Cabada, Veracruz, Mexico
  • Ann Arbor, Michigan, USA
  • Aracaju, Brazil
  • Asheville, North Carolina, USA
  • Athens, Peristeri, Greece
  • Atlanta, Georgia, USA
  • Austin, Texas, USA
  • Baltimore, Maryland, USA
  • Bangor, Lewiston/Auburn, Portland Areas, Maine, USA
  • Banyoles, Catalonia, Banyoles
  • Barcelona, Barcelona, Spain
  • Belém, Brazil
  • Belo Horizonte, Brazil
  • Berlin, Berlin, Germany
  • Birmingham, Alabama, USA
  • Blacksburg, Virginia, USA
  • Boa Vista, Brazil
  • Bogotá, Colombia
  • Boston Area, Massachusetts, USA
  • Boulder-Denver Metro Area, Colorado, USA
  • Brasília, Distrito Federal, Brazil
  • Bristol & Bath City Region, United Kingdom
  • Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
  • Calgary, Alberta, Canada
  • Campo Grande, Brazil
  • Cancún, Mexico
  • Cape Town, Western Cape, South Africa
  • Catania, Italy, Italy
  • Charlotte, North Carolina, USA
  • Charlottesville, Virginia, USA
  • Chiayi, Taiwan
  • Chicago Wilderness, Illinois, USA
  • Chihuahua, Chihuahua, Mexico
  • Christchurch, Canterbury, New Zealand
  • Ciudad de México, México
  • Cleveland-Akron-Canton, Ohio, USA
  • Colombo, Brazil
  • Colorado Springs, Colorado, USA
  • Concepción, Concepción, Chile
  • Conde, Brazil
  • Corpus Christi, Texas, USA
  • Cuiabá, Brazil
  • Curitiba, Brazil
  • Dallas / Fort Worth, Texas, USA
  • Diamantina, Brazil
  • Duluth, Minnesota, USA
  • El Paso, Texas, USA
  • Ensenada, Baja California, Mexico
  • Eugene-Springfield, Oregon, USA
  • Florianópolis, Brazil
  • Fort Collins, Colorado, USA
  • Fortaleza, Brazil
  • Georgetown, Penang, Malaysia
  • Glasgow, Scotland
  • Goiânia, Brazil
  • Greater Manchester, United Kingdom
  • Greater Philadelphia Area, Pennsylvania, USA
  • Halifax, Nova Scotia, Canada
  • Hermosillo, Hermosillo, México
  • Hoboken, NJ, USA
  • Hong Kong SAR, China
  • Houston, Texas, USA
  • Indianapolis, Indiana, USA
  • Itapetininga, Brazil
  • João Pessoa, Brazil
  • Karlovac, Croatia
  • Klang Valley, Selangor/Kuala Lumpur/Putrajaya, Malaysia
  • La Paz, La Paz, Bolivia
  • La Plata, Buenos Aires, Argentina
  • Lake Charles, Louisiana, USA
  • Lansing, Michigan, USA
  • Lecce, Italia
  • Leicester, United Kingdom
  • Lima, Perú
  • Liverpool City Region, United Kingdom
  • Logan, Utah, USA
  • London, Greater London, United Kingdom
  • Los Angeles County, California, USA
  • Lower Rio Grande Valley, Texas, USA
  • Luxembourg, Luxembourg
  • Macapá, Brazil
  • Macau SAR, China
  • Macelo, Brazil
  • Madrid, Madrid, España
  • Manaus, Brazil
  • Manhattan, Kansas, USA
  • Maui, Hawaii, USA
  • Mazatlán, Sinaloa, México
  • Medellín, Antioquia, Colombia
  • Miami, Florida, USA
  • Minneapolis/St. Paul, Minnesota, USA
  • Monterrey, Nuevo Leon, Mexico
  • Nairobi, Kenya
  • Naples, Naples, Italy
  • Nashville, Tennessee, USA
  • Natal, Brazil
  • New Orleans, Louisiana, USA
  • New York City, New York, USA
  • Newcastle upon Tyne, United Kingdom
  • Newport News, Virginia, USA
  • Nilteroi, Brazil
  • Omaha, Nebraska, USA
  • Ostuni, Brindisi, Italy
  • Palmas, Brazil
  • Pamplona – Iruña, Navarra, Spain
  • Panamá, Panamá
  • Parintins, Brazil
  • Pittsburgh, Pennsylvania, USA
  • Port Aransas, Texas, USA
  • Port Harcourt, River State, Nigeria
  • Porto Alegre, Brazil
  • Porto Velho, Brazil
  • Prague, Czech Republic
  • Quito, Pichincha, Ecuador
  • Raleigh, North Carolina, USA
  • Recife, Brazil
  • Richmond, Virginia, USA
  • Richmond, British Columbia
  • Rio Branco, Braizl
  • Rio de Janeiro, Brazil
  • Rochester, New York, USA
  • Roma, Italy
  • Sacramento, California, USA
  • Salt Lake City/The Wasatch, Utah, USA
  • Salvador, Brazil
  • San Antonio, Texas, USA
  • San Diego, California, USA
  • San Francisco Bay Area, California, USA
  • Santarem, Brazil
  • Santiago, Chile
  • São Luis
  • São Paulo, Brazil
  • Seattle-Tacoma Metropolitan Area, Washington, USA
  • Spartanburg, South Carolina, USA
  • St. Louis Metro Area, Missouri and Illinois, USA
  • Tallahassee, Florida, USA
  • Taranto, Italy
  • Tel Aviv, Israel
  • Tena, Napo, Ecuador
  • Teresina, Brazil
  • Teton-Yellowstone Communities, Wyoming/Idaho, USA
  • Tokyo, Setagaya, Japan
  • Torreon, Coahuila, Mexico
  • Trento, Trento, Italy
  • Trinitapoli, Barletta-Andria-Trani, Italy
  • Tulsa, Oklahoma, USA
  • Tuxtla Gutierrez, Chiapas, Mexico
  • Vail, Colorado, USA
  • Vicenza, Italy
  • Victoria, Tamaulipas, México
  • Vitória, Brazil
  • Washington D.C. Metropolitan Area, Washington DC, USA
  • Wilmington, Delaware, USA
  • Youngstown, Ohio, USA
  • Zagreb, Croatia

35K

More than 35,000 people participated

963K

Over 963,000 observations were made

31K

31,000+ species were found

1100+

1,100+ rare / endangered / threatened species documented!

MOST OBSERVATIONS

Cape Town, South Africa made the most observations with 53,763

MOST SPECIES

Cape Town, South Africa found the most species with 4,588

MOST PARTICIPANTS

San Francisco, CA, USA had the most participants with 1,947

For a complete list of 2019 results see the 2019 Leaderboard

Results of Participating Cities 2018

68 Cities Took Part

  • Ahmedabad, India
  • Amarillo, Texas, USA
  • Austin, Texas, USA
  • Baltimore, Maryland, USA
  • Bangor, Lewiston & Portland, Maine, USA
  • Barcelona, Catalonia, Spain
  • Berlin, Berlin, Germany
  • Bogotá, D.C., Colombia
  • Boston Area, Massachusetts, USA
  • Boulder, Colorado, USA
  • Bristol & Bath, United Kingdom
  • Cádiz, Spain
  • Campo Grande, Brazil
  • Charlottesville, Virginia, USA
  • Chicago Wilderness Region, USA
  • Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina
  • Cleveland-Akron-Canton, Ohio, USA
  • Curitiba, Paraná, Brazil
  • Dallas/Fort Worth (DFW), Texas, USA
  • Denver Metro Area, Colorado, USA
  • El Paso, Texas, USA
  • Florianópolis, Brazil
  • Greater Concord – Cabarrus County, USA
  • Guimarães, Braga, Portugal
  • Hermosillo, Hermosillo, México
  • Hong Kong SAR, Hong Kong SAR, China
  • Houston, Texas, USA
  • Indianapolis, Indiana, USA
  • Klang Valley/Greater Kuala Lumpur, Malaysia
  • La Plata, Buenos Aires, Argentina
  • London, London, United Kingdom
  • Los Angeles County, California, USA
  • Lower Rio Grande Valley, Texas, USA
  • Madrid, Madrid, Spain
  • Manaus, Amazonas, Brazil
  • Maui, Hawaii, USA
  • Miami, Florida, USA
  • Minneapolis-St. Paul, Minnesota, USA
  • Monterrey Zona Metropolitana, Nuevo Leon, México
  • Mumbai, India
  • Nashville, Tennessee, USA
  • New York City, New York, USA
  • Omaha Metro, Nebraska, USA
  • Padova, Italy
  • Palmer Station, Antarctica, USA
  • Pittsburgh Region, Pennsylvania, USA
  • Plymouth, United Kingdom
  • Prague, Czech Republic
  • Richmond, Virginia, USA
  • Rio de Janeiro, Brazil
  • Roma, Italy
  • Salvador, Brazil
  • San Antonio, Texas, USA
  • San Diego County, California, USA
  • San Francisco Bay Area, California, USA
  • São Paulo, Brazil
  • Seattle Metropolitan Area, Washington, USA
  • Southern Oregon, USA
  • Southwest Louisiana, Louisiana, USA
  • St. Louis Metro Area, Missouri and Illinois, USA
  • The Wasatch, Utah, USA
  • Tokyo, Tokyo, Japan
  • Triangle Area, North Carolina, USA
  • Tulsa Region, Oklahoma, USA
  • Twin Ports (Duluth and Surrounding Area), Minnesota, USA
  • Vancouver, Canada
  • Washington, D.C. Metro Area, USA
  • Waterloo Region, Canada

17K

More than 17,000 people participated

441K

Over 441,000 observations were made

18K

18,000 species were found

599

599 rare / endangered / threatened species documented!

SAN FRANCISCO

San Francisco swept all three categories with 41,737 observations, 3,211 species, and 1,532 participants.

For a complete list of 2018 results see the 2018 Leaderboard

Results 2017

16 Cities Took Part

  • Austin, Texas, USA
  • Boston Area, Massachusetts, USA
  • Chicago, Illinois, USA
  • Dallas/Fort Worth (DFW), Texas, USA
  • Houston, Texas, USA
  • Los Angeles County, California, USA
  • Miami, Florida, USA
  • Minneapolis-St. Paul, Minnesota, USA
  • Nashville, Tennessee, USA
  • New York City, New York, USA
  • Salt Lake County, Utah, USA
  • San Francisco Bay Area, California, USA
  • Seattle, Washington, USA
  • Triangle Area, North Carolina, USA
  • Twin Ports (Duluth and Surrounding Area), Minnesota, USA
  • Washington, D.C. Metro Area, USA

4K

More than 4,000 people participated

125K

Over 125,000 observations were made

8,600

8,600 species were found

392

392 rare / endangered / threatened species documented!

MOST OBSERVATIONS

Dallas/Fort Worth made the most observations with 23,957

MOST SPECIES

Houston found the most species with 2,419

MOST PARTICIPANTS

Los Angeles had the most participants with 1,034 (includes people who submitted via social media)

Results 2016

2

2 cities took part, San Francisco versus Los Angeles

1K

Over 1,000 people participated

19,800

* Over 19,800 observations were made

2,544

2,544 species were found

Los Angeles beat San Francisco! Here’s the breakdown

SF Bay Area

9,389

observations

1,551

species

444

people

L.A. County

10,353

observations

1,601

species

574

people

Social