Leo is trying to be a tough guy. The stunning cat was all attitude, stalking some neighborhood birds from a comfortable perch inside a window. But when the cat comes face to face with the birds, Leo ...

The owner's other cat knew exactly where to watch the bird through the window, clearly using more brain cells.

You might notice your cat pause at the window, focus on a bird outside, and make a quick clicking or chirping sound. It isn’t a meow or a growl. It’s a behavior known as chattering, and it’s fairly ...