This makes sense, the Audubon Society does this with birds. https://www.audubon.org/conservation/about-great-backyard-bird-count https://www.audubon.org/conser

This makes sense, the Audubon Society does this with birds. https://www.audubon.org/conservation/about-great-backyard-bird-count https://www.audubon.org/conservation/about-great-backyard-bi... Everyone counts their "back yards" and they compile all the data. About the same difficulty as the squirrel count, but you are trying to identify what kind of bird. On the other hand, I don't think that number is right. Based on my trips to NYC, and the amount of squirrels I've seen I think it's way low. But I may be skewed by the number of pigeons that are also in the park.