- "I got a sea slug! What, it thought it could outrun me?" —New Leaf
The sea slug is a benthic sea creature found at the bottom of the sea in New Leaf. It is indicated by a circular shadow, and diving is the only way of capturing it. Once caught, an exclamation mark will appear above the water followed by the player swimming up to the surface.
Donation to the museum
In New Leaf
"Although they have no shells, sea slugs are more closely related to spiral shells than anything else. Their vivid colors and patterns and variety of shapes and sizes make them popular with divers. Sea slugs are hermaphrodites, so they are all capable of mating with one another, regardless of gender."
- Main article: Sea slug on Wikipedia
While referred to in New Leaf as a "sea slug", Hypselodoris festiva is technically a nudibranch, an aquatic mollusk similar to sea slugs though biologically different. Nudibranchs on the whole are brilliantly colored and adorned with extraordinary fringes and tentacles, the purpose of which varies: in some cases it serves as camouflage to help the animal blend in with surrounding plantlife, and in others it belays a warning to predators that the nudibranch is unpalatable or toxic.