humans cant rotate their ears specifically bc have the best hearing in the world in one category; we echo-locate passively. our hearing is so good omni-directionally that it functionally extends our sense of touch by a meter or so. the way you can tell when someone is standing directly behind you when ur sitting? dogs can't do that. you can actually really re-producibly scare your dog by sneaking up on them bc their hearing isn't as good as ours