They are absolutely great, but you should stay and talk to a rehabber if you would want to adopt this bird if they cannot release him. They're rehabbers not a shelter.
You can take the pigeon to them on Monday morning. They will take your bird and he will live with others they have there.
Go straight there. They will help you for sure...
Call them at (646) 306-2862 They are very nice and may be able to help. It may be good to go there and talk personally to them. I don't think they are open today since it's a holiday.
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