Philadelphia City Nature Challenge 2020

Contact Name:
Navin Sasikumar
Filed in:
Things to do near Philadelphia, PA » Activities » Outdoor-Activities

The Greater Philadelphia Area will be competing with cities around the world to see who can make the most observations of nature, find the most species, and engage the most people in the 2020 City Nature Challenge. Between April 24th and April 27th, take pictures of wildlife (animals, plants, fungi) and upload it using the iNaturalist app. The more observations you can make, and the more friends you can get to do the same, the better Philly's chances of winning.

We have a full list of guided walks on our website (, but you can simply go out on your own into your backyard, a weedy lot, or your neighborhood park and click away. It doesn't matter if you don't know what you took a picture of, iNaturalist has a machine identification system which will help you identify the species in your picture. There is also a community of experts and other citizen scientists who will help with identification if the machine ID fails.

The City Nature Challenge is organized worldwide by the California Academy of Sciences and the Natural History Museum of LA and it originally started as a friendly citizen-science competition between the two cities in 2016. It has now expanded with over 250 cities competing in 2020. Philadelphia participated for the first time in 2019, with over 500 people participating across the 4-day period and making over 13k observations and finding nearly 1600 species. Can we do better in 2020? It's up to you!

Just download the iNaturalist app on your cell phone and mark your calendars for this fun 4-day bioblitz. Winning cities get bragging rights and who doesn't want a chance to tell your friend from NYC that we have more citizen scientists than them?


On Friday April 24, 2020 at 12:00 am (ends Monday April 27, 2020 at 11:59 pm)

Venue Name : Various Locations in Greater Philadelphia

General Admission: USD 0.0

Street Address

Philadelphia, PA 19123


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