A classic meow is a greeting or request. Cats meow to get human attention or ask for food.
Drawn-out meows express impatience or complaint. Your cat may be bored, lonely, or complaining about something specific.
A throaty, melodic trill shows excitement and contentment. Your cat may trill while being petted or when watching prey.
Chirps are friendly hellos or greetings between cats. It's a cat's way of saying "I'm here, but not a threat."
Hissing indicates fear, anger, or territorial threats. Ears go back and cat looks bigger to scare off rivals.
Loud yowling or howling expresses distress. It means "Come help me!" when in pain, heat, or feels abandoned.
Chattering teeth isn't aggression, but excitement! It means a cat is focused intently on prey they want to hunt.