"Count the squirrels near your house as you leave for work, count the ones you see on your lunch break," Sullivan says.
"In addition to being interesting animals to watch, squirrels can tell us a lot about our local environment and how it is changing," the site says under photos of a grey squirrel in Lincoln Park and a fox squirrel in Brookfield. "To gain this insight, we must gather data about as many individual squirrels in as many places as possible. This is where you come in; you can be a Citizen Scientist."
The form where citizens report their squirrel sightings asks for their zip code, along with observations such as if dogs and cats are abundant at the location of a sighting and if squirrels are seen "obtaining" food in the area from garbage, bird feeders, or people.
Project Squirrel actually got its start in 1997, but the citizen census initiative just started in March.