We've got animals with all kinds of injuries and ailments. I've never thought of it.....but it would stand to reason that some would hear better than others......see better than others....some would lose their hearing......lose their sight, etc..., etc..., etc...

I'm sure age would be a factor, but I'm not sure it's the ONLY factor.

Never thought about this......but it's an interesting topic. I guess natural selection figures in, here, as well. The slow ones.....the ones with sight problems......ones that don't hear well........the really curious ones.......die, first.