Kneading with front paws stems from kittens nursing. It continues into adulthood when cats are happy/content.
Kneading
Head bunting or rubbing shows cats are comfortable around specific people, felines or objects in their environment.
Bunting
Tail held high signals feeling happy or affectionate. Watch for twitching which indicates irritation or overstimulation.
Tail Up
Self-grooming maintains coat condition. Social group grooming occurs between cats with close bonds.
Grooming
Scratching maintains claw condition, marks territory and relieves stress. Provide acceptable scratching posts.
Scratching
Chattering noises often accompany birds and prey they cannot immediately catch as a frustrated instinct.
Chattering
Sleeping a lot conserves energy for hunting bursts. Provide cat trees, beds and high perches for safety.
Sleeping