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City Nature Challenge 2021

April 30, 2021 - May 9, 2021

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.

April 30 – May 3: Taking pictures of wild plants and animals

May 4 – May 9: Identifying what was found

Taking part is easy:

  1. Find wildlife: It can be a plant, animal, or any other evidence of life found in your city.
  2. Take a picture: Take a picture of what you find. Be sure to note the location of the critter or plant.
  3. Share: Share your observations through iNaturalist or your city’s chosen platform!


April 30, 2021
May 9, 2021


Online event
CA United States + Google Map