 So what's with the frequencies that they can hear and what they can see? Can they see better? Can they hear better than we can? They can see better in the dark than we can, much better in the dark. The whole of their eyesight is tuned to half-light, I suppose is as good a way of describing it as any. Their ancestors hunted, well, they lived in very arid regions where there wasn't much to do during the day, not much in the way of prayer around, so they evolved hunting habits.