Nurse sharks are a species of shark known for their distinctive appearance and behavior. They have a broad, flat head and a stout body, typically growing up to 10 feet long. These sharks are usually found in warm, shallow waters, often resting on the ocean floor during the day. Nurse sharks are primarily nocturnal feeders, preying on small fish, crustaceans, and mollusks. They are known for their gentle nature and are often seen in groups. Unlike many other shark species, nurse sharks are not considered dangerous to humans, making them a popular attraction for divers and snorkelers in places like the Caribbean Sea and Florida.