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  • 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
  • 2026 City Nature Challenge - Natural History Museum
    Share your observations of wild plants and animals in the City Nature Challenge!
  • 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: California - California Academy of Sciences
    Use our interactive map to find bioblitzes and events across California


















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