Trilling
Trilling lands somewhere in between a purr and a meow. Also, trilling usually means that the cat is extremely pleased or even excited. It could also be a sign that they’re very excited to see you, especially when you get home after a long day.
It could also mean they want to snuggle on the couch or be thrilled about the food you’re making for them.
Chattering and clicking
Cat “chatter” is a very quiet but fast-paced “ack-ack-ack” sound. It also sounds like a clicking sound that cats generally make when they see birds or any other animals outside.
For now, we can’t really tell why they make it, but it seems that it always happens when cats see prey they don’t have easy access to. Maybe they’re watching a bird through a window, or we think it could be frustration or excitement.
Some scientists even noticed predators make similar sounds, mimicking their prayers as a way to sneak up on them. In conclusion, it might be the cat’s attempt to “tweet” just like a bird.