Just found an injured pigeon tonight

[Debadoo]

I know nothing about pigeons (other than I like to feed them in the park!). But tonight, while walking home from the train, I saw this little fella just sitting there unable to fly. He attempted to fly when I reached down to him, but it appears that he may have a broken wing. Obviously I couldn't just leave him there, so now he's at home with me....in a box with a blanket, a bowl of wild bird seed and a bowl of water. I live in Chicago and am new to this area as well and I have no idea what to do. I cannot keep the bird (my apartment lease permits it) and would love to be able to give him to a shelter that could care for him. The poor thing hasn't eaten or drank. He just sits very still. I did not see any obvious injury. I really don't know what to do! Anyone have any advice?