Hilton's Aeolid on Red Algae

Description

This aeolid nudibranch is generally considered to be a rather aggressive species. They fight with other nudibranchs and other members of their species! It feeds mainly on hydroids, but when offered other nudibranchs it attacked 15 of 21 species. Until 1975 it was known no farther north than the Monterey Peninsula; as the ocean warmed it spread north, reaching Bodega Bay by 2015.