Cats have the most expressive face in the Carnivore order. The slightest change in their face can indicate one of hundreds of emotions or moods. But there are tell-tale signs of certain moods. A complacent mood is indicated by a relaxed face, whiskers are often pushed forward on the face, ears are pricked, and the body is held normally. Aggression is indicated by the lips being curled back to reveal their teeth, the nose crumpled up, ears are laid back, and the whiskers are pulled flat against the face, and the body often is flat on the ground.
Cats are, for the most part, solitary and only come together to mate.
The exception is the lion. Cats are also very territorial, and keep a large home range. Usually, males have larger ranges that overlap several smaller females' ranges. This allows the male to have access to several females at once. Mating is usually a very violent affair, with screams and yelps coming from the female, and hissing and growling from the male.