Aplysia californica

Aplysia californica, commonly known as a sea hare, is a large, slug-like marine gastropod mollusk. These sea snails are characterized by a reduced shell, prominent tentacles resembling rabbit ears, and a smooth or warty body. They primarily feed on large seaweeds and are simultaneous hermaphrodites. When threatened, they can discharge a purple ink.

The Aplysia genus has been instrumental in scientific research, particularly in understanding the biochemical basis of learning and memory. Studies on its relatively simple nervous system have provided insights into neural plasticity, habituation, and sensitization, revealing fundamental mechanisms that are conserved across many species, including humans.123