City Nature ChallengeCities around the world will be competing to see who can make the most observations of nature, find the most species, and engage the most people in the 2020 City Nature Challenge.
Started in 2016 as a competition between San Francisco and Los Angeles, the City Nature Challenge (CNC) has grown into an international event, motivating people around the world to find and document wildlife in their cities. Run by the Community Science teams at the California Academy of Sciences and the Natural History Museum of Los Angeles County, 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 not only what can be accomplished when we all work toward a common goal, but also which city can gather the most observations of nature, find the most species, and engage the most people in the event. In light of the COVID-19 pandemic, the 2021 City Nature Challenge will not be focused on competition; instead we want to embrace the healing power of nature and celebrate tens of thousands of people all around the world, searching for and documenting their local biodiversity, together in this event.
The 2021 City Nature Challenge takes place in 2 parts
April 30 -
Taking pictures of wild plants and animals.
May 4 -
Identifying what was found.
To see a list of participating cities, click here
Taking Part is Easy
2020 Collective Results
Over 815,000 observations were made
32,000+ species were found
More than 41,000 people participated