This dorid nudibranch is a voracious predator of the bryozoan Membranipora and thus found on blades of giant kelp and on eel grass. It's almost pertfect camouflage may help protect it from predators such as fish.
These dorids are feeding on the underlying Membranipora bryozoan. Also, their orientation, right shoulder to right shoulder, suggests that they are mating. Both species are commonly found on blades of giant kelp as seen here.
