The Comeback Sea Slug
This nudibranch, or shell-less marine snail, is making a comeback to a location it hasn't been to in years along the California coast. First discovered off the coast of Southern California in 1902, Felimare californiensis was thought to be extinct in the region since 1984 due to pollution. But the nudibranch with its blue and gold color scheme has been spotted off the Southern California coast several times since 2003. Scientists have their fingers crossed that this indicates a larger comeback for the species.