1387-734 - Ceratosoma nudibranch, Anilao, Philippines.

1387-730 - Glossodoris nudibranch, Anilao, Philippines.

1387-639 - A Doriprismatica nudibranch face on portrait, Anilao, Philippines.

1387-600 - Two nudibranchs with two emperor shrimp riding on their backs, Tulamben, Bali, Indonesia.

1387-554 - A beautiful nudibranch, Doriprismatica atromarginata, feeds on a reef in Indonesia's Banda Sea.

1387-491 - A colorful nudibranch, Hypselodoris tryoni, crawls across a sandy sea floor in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

1387-490 - A colorful nudibranch, Hypselodoris tryoni, crawls across a sandy sea floor in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

1387-445 - A pair of Chromodoris annae nudibranch crawl on a large tunicate among the remote, tropical islands of Raja Ampat, Indonesia.

1387-442 - A vibrant nudibranch, Chromodoris sp., crawls across a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.

1387-366 - A beautiful nudibranch (Glossodoris cincta) crawls on the black sand seafloor in Lembeh Strait, Indonesia.

1387-327 - A pair of beautiful nudibranchs (Hypselodoris tryoni) crawl along the seafloor near Alor in the Lesser Sunda Islands of Indonesia.

1387-328 - A beautiful nudibranch (Hypselodoris tryoni) crawls along the seafloor near Alor in the Lesser Sunda Islands of Indonesia.

1387-242 - A beautiful nudibranch (Hypselodoris bullockii) crawls slowly across a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

1387-89 - A pajama nudibranch (Chromodoris quadricolor) attempts to climb up the side of a sea cucumber, Philippines, Southeast Asia, Asia

1387-59 - A gathering of robe hem hypselodoris nudibranchs (Hypselodoris apolegma), Komodo, Indonesia, Southeast Asia, Asia

860-291977 - Detail of a Krohn's Doris (Felimida krohnien) moving on rock, Ile d'Oleron, France

759-11615 - Dorid Nudibranch, Mexichromis multituberculata, Ambon, Moluccas, Indonesia

832-393711 - Pyjama Chromodoris quadricolor (Chromodoris Quadricolor) Magnificent star snail, nudibranch, Red Sea, Aqaba, Kingdom of Jordan

860-289873 - Nudibranch ( picta azorica). This subspecies is known only from the Azores. Santa Maria Island, Azores, Portugal, Atlantic Ocean

1350-2548 - Dorid nudibranch, Glossodoris averni, La Laguna, Puerto Galera, Mindoro, Philippines.

1350-2524 - Nudibranch, Chromodoris magnifica, Dumaguete, Negros Island, Philippines.

860-288897 - Giant Doris (Felimare picta), off Calella de Palafrugell, Costa Brava, Spain

1116-39939 - An Imperial commensal shrimp (Periclimenes imperator), photographed at night on the Spanish dancer nudibranch (Hexabranchus sanguineus), that it calls home, Philippines