Here's why:
* They live in the wild: Sharks are found in the ocean, their natural habitat.
* They are not domesticated: Unlike animals like dogs and cats, sharks have not been bred and trained to live with humans.
* They have their own instincts: Sharks act on their natural instincts, which are often different from human behavior.
While some sharks may be kept in aquariums or for research, they are still considered wild animals because their behavior and instincts are largely unchanged by human interaction.