Superbowl
For owls that are superb.
US Wild Animal Rescue Database: Animal Help Now
International Wildlife Rescues: RescueShelter.com
Australia Rescue Help: WIRES
Germany-Austria-Switzerland-Italy Wild Bird Rescue: wildvogelhilfe.org
If you find an injured owl:
Note your exact location so the owl can be released back where it came from. Contact a licensed wildlife rehabilitation specialist to get correct advice and immediate assistance.
Minimize stress for the owl. If you can catch it, toss a towel or sweater over it and get it in a cardboard box or pet carrier. It should have room to be comfortable but not so much it can panic and injure itself. If you can’t catch it, keep people and animals away until help can come.
Do not give food or water! If you feed them the wrong thing or give them water improperly, you can accidentally kill them. It can also cause problems if they require anesthesia once help arrives, complicating procedures and costing valuable time.
If it is a baby owl, and it looks safe and uninjured, leave it be. Time on the ground is part of their growing up. They can fly to some extent and climb trees. If animals or people are nearby, put it up on a branch so it’s safe. If it’s injured, follow the above advice.
For more detailed help, see the OwlPages Rescue page.
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What an Owl Knows by Jennifer Ackerman is a great book if you want to learn a lot in digestible, easy to understand language.
Also, don't hesitate to find a rescue/rehab near you and go look and ask questions. The people are all there because of their love for the animals, so they will talk your ears off if they aren't too busy. I did a 50 States of Owls last year if you're in the US, to show everyone there are lots of owl places to visit wherever you may be. Owls are in every place people are, so there are always some nearby.
You can also help local owl just by donating time, money, or supplies to your local rescue center. They always need paper towels, bedding, cleaners, and a ton of other basic supplies. No rehab I have come across in any country gets any tax money for their services, so it is all privately funded by people like us. I was even reading about someone helping from home raising grubs to feed to their local rescue animals so the place didn't need to buy them.
There are tons of opportunities for anyone to participate, no matter how much or little they have to give at the moment!