Today's Catch

The lettuce sea slug (Elysia crispata) has enlarged fleshy appendages that are folded over one another, with colors ranging from blue to green, with purple and red lining. The green coloring is what gives this mollusk it's common name, resembling a head of leafy green lettuce. The sea slug eats green algae, but not all of the algae they eat is digested. Some of the green algae gets shuttled off to make a home in those fleshy appendages (called parapodia).

In this video Smithsonian research zoologist Dr. Martha Nizinski takes viewers with her as she searches for crustaceans in the deep sea. She's particularly interested in finding squat lobsters, which despite their name, are actually crabs. On this dive in the waters off Curaçao, she discovers some living on a sunken piece of wood.

An X-ray image of a Monterey skate (Raja montereyensis) reveals a spine that extends like a tail out from the pelvic fin. The skeletons of skates, rays, chimaeras, and sharks are made of cartilage, rather than bone. Scientists in the Division of Fishes at the Smithsonian's National Museum of Natural History use X-ray images, like the one shown, to study the complex bone structure and diversity of fish without having to dissect or damage the specimen.

The Laysan albatross (Phoebastria immutabilis) breeds mainly in Hawaii and other Pacific islands where male and female pairs will incubate their egg for nine weeks. The pair participates in an elaborate courtship dance where movements and noises bond them together for the rest of their lives. After breeding season is over the birds move north and west towards Japan and Alaska.