We have a male Goldfinch who is staying in our bush out front all day and night for the past three days. He goes to our feeder and drinks from the birdbath, then goes back into the bush. I can walk right up to him and he doesn't leave. He tucks in his beak like he is sleeping. Should I leave him alone, take him to a rehabilitator, bring him inside and put him in a birdcage and feed him? I don't know what to do. At times it looks like his left wing is injured. Any advise would be appreciated.