Largest sea slug
black sea hare
99 centimetre(s)
Not Applicable ()

The black sea hare or California black sea hare (Aplysia vaccaria) is the largest sea slug species. It has been known to grow to 99 cm (3 ft 2.9 in) in length, and weigh nearly 14 kg (30 lb 13.8 oz).

There have been reports of particularly large specimens of Spanish Dancer sea slugs, but so far no evidence to confirm these can be as big as the black sea hare.