I noticed him while I was walking to the park, so I decided to take a video. He was flying around erratically, and seemed distressed. Luckily I was wearing my hat so I was able to place my hat over him and gently put my messenger back under the hat, and get him back to my apartment. This was a few blocks south of Prospect Park.
I'm really glad I acted quickly, because he could have easily gotten stepped on or run over. Here's a video:
I found him earlier this afternoon (July 9th) and after a few hours of being left alone in my bathroom, he is very friendly and readily perches on my finger, and doesn't seem afraid of me anymore.
I watched some videos on youtube about how to care for them. He's drank some water that I put in a dish for him, but he hasn't eaten anything yet. I offered him some sliced orange, banana, and seeds.
He has a tag on his leg starting with BBFC
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He's a really sweet friendly creature. But I don't have a cage for him or anything. But he's just been sitting wherever I place him and not really moving much. Also while I was holding him, I saw him trying to clean his feathers with his beak, and I think he has some irritation or infection. He is certainly a bit dirty.