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.
Sign up today!
The 2024 CNC takes place in 2 parts
April 26 – April 29, 2024
Taking pictures of wild plants and animals.
April 30 – May 5, 2024
Identifying what was found.
Results will be announced on Monday May 6, 2024.
Taking part is easy
It can be any plant, animal, or any evidence of life found in your city.
Take a picture 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.