Cats apologize to humans by following a specific set of behaviors. These behaviors include bringing "gifts" such as dead animals or toys to their owner, gentle head-butting or rubbing against their legs, and purring loudly. Cats use these actions as a way to make amends or seek forgiveness from their owners after any perceived wrongdoing. These behaviors are a form of communication from the cat to their human, showing that they are sorry for any misbehavior or misunderstandings.

By understanding these apology behaviors, cat owners can better interpret their feline companion's feelings and strengthen their bond with them.