 The remarkable thing about cats' ears is not that they can hear very high-pitched sounds, which they can do. They can hear the little squeaks that mice make, and that's obviously been very useful to them. But simply because cats are much smaller than us, their ears are correspondingly smaller. They're not large like the eyes are. And so hearing high-pitched sounds is actually something that comes naturally. There's no great trick to that. The trick is that they can also hear very low-pitched sounds. They can hear men talking.