City Nature Challenge 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 collaborate to see what can be accomplished when we all work toward a common goal
City Nature Challenge - California Academy of Sciences Protecting biodiversity in the Bay Area, California, and beyond is as easy as taking pictures Take part in the City Nature Challenge between April 24–27, 2026, by joining a bioblitz or observing on your own The City Nature Challenge is an annual global urban nature census
City Nature Challenge - Tri-Valley Conservancy 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
City Nature Challenge Marks 10 Years of Bringing the World Together to . . . The City Nature Challenge is a community-based collaborative event that harnesses scientific data to regenerate ecosystems and reverse biodiversity loss By observing and documenting local wildlife, community scientists give insight into the biodiversity of urban areas throughout the world
City Nature Challenge - City of Long Beach City Nature Challenge is an international initiative organized by the Natural History Museum of Los Angeles County to record wildlife population data in urban areas
City Nature Challenge - Catalina Island Conservancy Document local biodiversity as part of a team while hiking and exploring Catalina's wildlands Findings documented during this experience will support City Nature Challenge, an international event that tracks urban biodiversity, providing valuable "research-grade" data to scientists, conservationists and land managers for monitoring species and habitats Working in small groups, we’ll survey
City Nature Challenge - Observation. org 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
City Nature Challenge 2026 - Beautiful Hays County The City Nature Challenge is an annual four-day bioblitz with corresponding identification period immediately following The Challenge takes place the last weekend of April, from Friday through Monday via iNaturalist