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Urticina crassicornis is usually molted with green and red, but sometimes they are solid red like this one. Unfortunately I wasn't able to see the tentacles.
Spotted in a tide pool at Tongue Point.
A non-selective and opportunistic predator, Urticina crassicornis, may feed on crabs, sea urchins, mussels, gastropods, chitons, barnacles, fish, and sometimes sea stars and stranded jellies. A peculiar prey, the sun star, Pycnopodia helianthoides commonly known as the "Sunflower Star", is found in Washington state and has a size much greater than U. crassicornis, sometimes ranging up to 3 ft. in armspan. This anemone exhibits both intracellular and extracellular digestion. Food is caught within the tentacles which then move the prey towards the oral disc.(Wikipedia)