City Nature Challenge 2021

What is It?

Macaulay Honors College is thrilled to be the official New York City host of the City Nature Challenge for the 5th consecutive year. Join us in supporting science education, sustainability, and environmental awareness. Over 370 cities will participate this year!

Throughout the weekend of April 30 – May 3, New Yorkers can safely get outside to photograph examples of urban wildlife throughout the five boroughs, supported by Macaulay Honors College, and inspired by virtual events.


After observation days have ended, the iNaturalist community will help properly identify and catalog the species in a marathon tech session. Final results will be announced by iNaturalist (and on this page).

Why is Community Science Important?

Science exploration is for everyone—and can be done by anyone. Participating in these projects helps to improve science literacy for all. City Nature Challenge contributes to our understanding of urban wildlife in New York City and the planet as a whole.

Exploring the natural world (safely distanced from other) is relaxing and fun—a great way to center yourself after months indoors.

Special Thanks

California Academy of Sciences, Natural History Museum of Los Angeles County, NYC Parks, Madison Square Park Conservancy, Hudson River Park Trust, Green-Wood Cemetery, NYBG, Alliance for Flushing Meadows Corona Park, Randall’s Island Park Alliance, LES Ecology Center, Brooklyn Bridge Park Conservancy, WSP Eco Projects, Greenbelt Conservancy, GENSPACE, Bronx River Alliance, Freshkills Park Alliance, Brooklyn Greenway Initiative, Battery Park City Authority.


Email or text/call (262) 228-8682.