Discovering nature at the Philadelphia Science Festival

Can Philadelphia find more animals than Atlanta? More plants than Prague? More fungi than Fort Collins or more slime molds than Medellin? Philly takes on cities all over the world April 26–29 for the City Nature Challenge, a competitive urban bioblitz.

Find wildlife, snap a pic, and upload it using the iNaturalist app to take part. Anywhere in Philadelphia and its neighboring counties is habitat, whether that's a wildlife refuge or the sidewalk right outside your house. Learn more at or download the iNaturalist App.