We have several rabbits living in/around our yard which we've always welcomed year after year. I noticed recently that one young one leaned over to its right when running, but since it appeared to move reasonably well, just thought it was a birth malformation or postnatal injury. Now I just startled it in the yard when I took out the compost, and it's definitely worse; the bunny fell over when trying to get away from me, had a hard time righting itself, and then oddly turned its head to the right and back over its side. There's clearly some neurological pathology going on here. My question is, do I do anything about it? I might be able to catch it if it falls over again when I surprise it. But...do I bother to take it to a vet? In the past we've saved half-dead baby squirrels and families of ducks, not to mention numerous stray cats, but I'm not sure I'm prepared (and certainly know I'm not, financially) to deal with a bunny with a brain tumor.