Natural history museum, research institute, aquarium, planetarium, rainforest, & so much more — all under one living roof.
California Academy of Sciences
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#CityNatureChallenge Day 2, as of 4/26 8:45am PT:
🌻 52,451+ Species
🌻 1,319,064+ Observations
🌻 65,946+ Observers
🌻 11,842+ Identifiers
Learn more & find events worldwide: citynaturechallenge.org
#CommunityScience #ActsOfScience @nhm.org
Grab a friend and head outside because there’s just 🚨ONE MORE DAY LEFT🚨 to make observations for the 2026 City Nature Challenge!
After today, you can still *upload* your photos onto @inaturalist.bsky.social—but they need to be *photographed* between April 24–27 to count as part of the challenge.
Right now, thousands of people all around the world are getting outside and documenting their local nature to help science and conservation.
Here are just a few highlights from the first 24 hours of the 11th annual City Nature Challenge. ✨
California Academy of Sciences
#CityNatureChallenge Day 1, as of 4/25 8:45am PT:
🌱 40,358+ Species
🌱 660,776+ Observations
🌱 38,432+ Observers
🌱 8,315+ Identifiers
It’s not too late to join the world’s largest annual community science event! Three easy steps: get outside, photograph wild nature, and share it on the free @inaturalist.bsky.social app. 👀🤳
In case you need some inspiration, check out these snapshots of what people have been seeing in their cities around the world.
#CityNatureChallenge Day 3, as of 4/27 8:45am PT:
🌿 60,813+ Species
🌿 1,977,189+ Observations
🌿 87,076+ Observers
🌿 15,106+ Identifiers
Learn more & find events worldwide: citynaturechallenge.org @nhm.org
