Cats have instinctive behaviors to catch three kinds of prey: mice, birds and fish. However birds are a bit harder to catch than mice, and a well fed cat who di

Cats have instinctive behaviors to catch three kinds of prey: mice, birds and fish. However birds are a bit harder to catch than mice, and a well fed cat who didn't get to watch his mother hunting them may never become proficient. But proficient ones catch quite a few birds. Source: my parents cat caught a lot of birds. Also I think Catchwatching by Desmond Morris.