Celebrate Earth Day by taking part in a Bay Area citizen science project FacebookTwitterEmail 1of2 Look for animals and plants at the beach — or at a park or just in your backyard — and then photograph and upload your observations as part of a global “bio-blitz” called City Nature Challenge April 30 to May 3.Courtesy Maritime AquariumShow MoreShow Less 2of2 Volunteers for Hawkwatch identify raptors, like this red-tailed hawk (center).Sophia Germer / The Chronicle 2015Show MoreShow Less Taking part in a citizen science project is a way to celebrate Earth Day while learning something new about the local environment. It has the added bonus of helping to alleviate feelings of anxiety about climate change — and it’s a good pandemic-era project for families doing distance learning or anyone spending more time outdoors.