If your cat is eyeing up a bird outside the window, its intense glare may be accompanied by a quick chattering sound.
Experts believe that this chattering is a sound of frustration. The cat can see that the bird is there and wants to catch it, but equally knows that the window is preventing the catch.
Photo by Caroline/ Unsplash
Other experts, however, believe that this is a natural instinct and that the chattering warms up the muscles of the cat before they chase their prey.