Possibly Injured Pigeon in Seattle

[SeattleJen]

In Seattle:
I came home today to a pigeon standing against my front door. He didn't move at all as I approached and only scooted out of the way and off the porch when I got very close. He immediately tried to come back up on the porch and out of the rain. From the droppings, it looked like he had been there a while. He seems to walk okay, but had trouble flying even to get back up one step to the porch. One wing looks as though it is up a little higher than the other. He is completely uninterested in the black sunflower seed I put out.

Now he is huddling out next to my neighbors porch in the miserable weather. I assume he is injured from his unusual behavior, but am not sure. How long should I wait before concluding he is injured? I can't bring him inside because I have other animals and very small apartment. Should I make a little box for him on the porch out of the rain? I can call PAWS in the morning if he is still there and see if they can help him.

Thanks for any advice you can offer.