‘Cats chitter when they see a bird,’ she said. ‘They make this little squeaky noise. People think it’s adorable. I’ve used it in videos. Cats chitter, because they’re excited, because they’re about to start hunting. But when the hunt begins, they’re silent. They don’t make a sound. They come at their prey as quietly as they can, because a hunt only counts if there’s a kill at the end.’ Tory and Luis exchanged a horrified look.