Aplysia californica

Aplysia californica, commonly known as the California sea hare, is a large marine mollusk found along the Pacific coast of North America. It belongs to the same group as snails and slugs but is notable for its soft, elongated body and external shell remnants. Aplysia is often used in scientific research because its nervous system is relatively simple, making it easier to study how nerves and synapses work. It feeds primarily on algae, and despite its size, it plays a role in maintaining the health of coastal ecosystems.