Based on research and by studying the rods and cones they have, it's been determined that they doo see very well at night - esp so at dusk and dawn as already stated. They cannot see in total darkness though--though that's hardly ever a consideration. I have noted though, that they're much less skittish after dark. I had them walk up to my tree after dark and I can't get them to leave. I've even climbed down since I didn't want to spend the night in the tree and they hung around until I started walking. They can see, they just aren't as concerned - they seem to know we CAN't see them!