Something damaging young fruit trees

So sad, just checked on my young fruit trees, something has damaged them severely. What would do this? Halfway around lower part of tree, bark looks chewed off. I have fences around the individual trees. I do have tunneling rodents, which I thought were moles. Will these trees survive? Should I spray it with pruning spray or wrap it with something? Should I wrap my unaffected trees to prevent this?

Chew marks. Looks like rabbits.

Rabbits. I didn’t know they did this. Thank you

Voles perhaps?

My bet would be on voles. Some friends of mine had most of their fruit trees look like that in the spring of last year, and there it definitely was voles. Have you had snow? A sign it may be voles is if the chewed part only extends a little bit above highest snow level (voles not being terribly big). The weird thing, though, is the strips of bark hanging from the upper edge of the wound in the second picture. It looks like the creature has started pulling the bark off, and I wasn't aware that either voles or rabbits do that... As far as I know they mainly chew the bark off "sideways". But I assume your fencing around the trees would keep deer out?