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

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

Dorid Nudibranch, Mexichromis multituberculata, Ambon, Moluccas, Indonesia

Ceratosoma nudibranch, Anilao, Philippines.

A pair of pink nudibranchs, Lembeh Strait, Indonesia.

Yellow-Ridged Ceratosoma (Ceratosoma flavicostatum) nudibranch, head on view, Komodo National Park, Indonesia.

Chromodoris Annulata nudibranch, Red Sea, Egypt.

Pair of Chromodoris annae nudibranch with brilliant blue and yellow skirt, crawling over green and pink coral, Anilao, Batangas, Philippines.

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.

Glossodoris nudibranch, Anilao, Philippines.

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

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

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

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

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.

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.

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

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

A Doriprismatica nudibranch face on portrait, Anilao, Philippines.

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

Nudibranch, Chromodoris magnifica, Dumaguete, Negros Island, Philippines.

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

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

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

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

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

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