This bird was eating bugs in the backyard and it was gigantic! After google imaging waterbirds from the Audubon Institute website, I thought it was a bittern. Then I found this website where you can search by different parts of the bird and it narrows it down bit by bit. www.whatabird.com It's really cool!
So it said it's an American Bittern, which is a waterbird that likes freshwater wetlands. I bet it gets its food from all the swamps and ponds in City Park.
I took this through the window so I wouldn't scare it. It's body is maybe a foot long, and then it's neck and legs make it two feet tall.
Andrew had told me that he saw a giant nest a block away on a dog walk. Maybe this is the bird!