Many owners will have heard and seen their cat chattering when they spot prey. Indoor cats do it too even if they have never hunted.
So why do they do this? Is it because they can’t get to the prey?

In fact, this is normal hunting behaviour. Your cat’s instincts are kicking in – even if they have never hunted they still have those instincts. Experts used to believe cats were excited or frustrated when they chatter or that they were mimicking their prey’s sounds. Cats hunt for a large variety of prey, though, and most of them sound nothing like a cat’s chattering.
Most experts now think that the chattering jaw movements are similar to the killing bite. Your cat is eagerly anticipating having a good bite.

Perhaps we can satisfy indoor cats by giving them a toy to chase & catch after the prey has left and give the cat a treat 😉

I think the noise is very funny. I laugh whenever I hear Dirk do it and it’s usually when he sees birds nearby (pigeons seem to love teasing him by sitting on the balcony railing).