Explore El Polin Spring in the Presidio with us for a naturalist adventure and celebration of biodiversity! A bioblitz is a quick, intense survey of the species present. Hone your observation skills, become a field biologist for the day, and enjoy some nature in the city and friends! We will use iNaturalist to document the organisms we see.

This event is part of the City Nature Challenge, 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. Our observations will count towards the San Francisco Bay Area team in the quest to beat LA.

This event is for Parks Conservancy members only—if you are not a member, you can join online here or contact us at (415) 561-3060 to give by phone.