TheVerge.com posted an article how Smithsonian researchers and a photographer placed "biocubes" in a bunch of different locations around the world to document what creatures and general life passed through them in a typical day. Central Park was included in this research.
They took photos of everything that came within the range of the one-cubic-foot area, created photo compositions to show the global wildlife. In the article there is a photograph of the biocube and what it looked like out in the natural wonder that is Central Park. While a biocube is very small, the amount of creatures that went through it in a 24 hour period is staggering.
They reported that while New York City apparently has a whole lot of leaves and insects, there were mysteriously no rats. Even the city's biggest apartment nemesis, the cockroach, was represented. Many varieties of birds, as well as squirrels and racoons were pictured, but no rats!
To learn more about this experiment and where the results will be on display, click here.