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Check for the bird's parents. Look for injuries. Don't try to raise it yourself. Call a wildlife rehabilitator.
If the parents don't return to the nest within a couple of hours or if you're sure the parents are not alive anymore, you'll need to call for help for the bird. If the bird has trouble moving or flapping its wings, it's likely injured. Also, if the bird is shivering, it may be in trouble. An injured bird is also a reason to make a call. It's actually illegal to keep and raise a wild bird. You must have special permits from both the local and federal governments to raise wild animals. Wildlife rehabilitators have the skills and training to care for baby birds. You can find one on your local government's wildlife websites, or you can try calling a local veterinarian or animal shelter, as they may know rehabilitators in the area. Ask for advice on how to feed and water the baby and how to keep it warm. Be patient with your questions, and ask for additional advice by saying, "Is there anything else that I should know (or be careful about)?"