I wrote about Monk parakeets before.

Well, it looks like the Brooklyn College Environmental Education Science Masters Program. members are involved in some cutting edge research:

"On the athletic field we saw 5 birds perched on the lamp post on the right side. They were flying back and forth. While we watched their flight we viewed one of the birds relieving themselves. We approached the ramp and examined the droppings. We counted 11 droppings and saw a distinct color change in its appearance. This change was not the same as what we had previously viewed, it was purple in color."

"On East 23 and Avenue J we saw three birds eating acorns and making a lot of noise. "

This reminded me: