Lisa Fosco, director of animal care at the Ohio Wildlife Center, wrties:

Unfortunately humans are the primary predator of adult owls (cars, power lines, rodenticides).  As far as natural predators, the Great Horned Owl is the most notable predator.  They most commonly prey on Barred Owls, and will also eat Eastern Screech Owls (both common species in our area).  Other Ohio species that they may predate would include Saw Whet, Long Eared and Short Eared Owls.  I am not sure if any of these less common species inhabit our ravine, but it is possible.

Eggs and owlets are predated by anything that finds them, but the most common predators would probably be the raccoon and the black rat snake.

Also, I just wanted to let you know that there is an injured coyote in the ravine.  He is limping on his front right leg and commonly crosses Cooke Rd by the creek.  I have been trying to keep an eye on him, and have seen him several times in the last few weeks.  I tracked him after the last two heavy snowfalls and plan to look for him tonite (since we have more beautiful snow).  I wanted to make sure that if anyone sees him, they dont panic and do anything to try to intervene.  He looks very healthy and his limp has improved significantly.  His limp is now so minor that the other day  I could hardly distinguish his tracks from others.  Also, please let people know to keep their bird/squirrel feeders full right now.  Wild animals have also been congregating around water sources.  Most wont eat snow since they are working so hard to conserve heat, so putting out shallow bowls of water (tepid or luke warm) near the feeders has been helpful.  The robins and other ground feeding birds are just starting to attract attention, so if you see any that look questionnable, it is a good idea to put out a plate of fruit (cut apples, whole or halved grapes, etc).  

If you see any birds (or any wild animal) that are slow moving and down in the snow, PLEASE get them in to us asap.  If it is after hours, call me directly and I will take them (415-336-6661).  We have lost quite a few birds in the last week and several today that died en route to us, so they likely need helpquick.  The freezing rain last night took its toll on many that were roosting/hiding in the trees/brush, and many froze to chunks of ice.  One goldfinch was actually frozen into an ice block with an air hole, still working on her now.  So, please keep your eyes open.