Certainly doesn't look like a quail to me either. Markings and the shape of beak, body and feathers is wrong. Doesn't look like anything I've ever seen, but I actually had to google 'grouse' - we don't have those around here (here being Denmark, so I'm probably not much of a help, but I do like a bird identification challenge ^^). The beak looks kind of crow-like to me though - the grouse images I found didn't seem to have that kind of beak. But the feathers do seem kind of like grouse feathers, so maybe te pics just didn't show the right species.