I have heard that birds have exceptional eyesight. How far does this mean they can see? What's the resolution like? Are we talking about just vague shapes or something like, at 100 feet, seeing individual hairs on a dog's fur coat?
I've also read that, in general, primates are the only mammals that have color vision. I know birds are not mammals. Is it common for birds to have color vision as well, like primates?