What To Do If You Find a Sick or Injured Bird
Often birds are stunned from hitting a building or glass window and they will recover on their own if taken out of danger. Feral cats are obviously a great danger. Birds found on the ground during migration may just be exhausted or stunned.
If the bird is a fledgling, try moving it to a safer nearby spot. The mother is probably nearby watching.You can tell a fledgling by its short feathers and downy appearance.
If you believe the bird is sick or badly injured, carefully, wearing gloves, place it a cardboard box. Do not try to feed the bird or give it water. Cover the box with a towel. Keep the box out of the sun or cold. If it doesn't recover, call the Wild Bird Fund, 646-306-2862 or visit their website, www.wildbirdfund.org
Sometimes, there just isn't anything you can do. I photographed this gull with a lure attached to it's wing. I've also encountered gulls and passerines entangled in monofilament nylon fishing line.
I've notified the NYC Parks Department and they've been very responsive.