Jeff Rotman / Snorkeler holding Sea Cucumber (Holothuria edulis) swimming with wild Bottlenose Dolphin (Tursiops truncatus), Nuweiba, Egypt - Red Sea. Model released Model released.

Georgette Douwma / Edible sea cucumber (Holothuria edulis) one of the edible species of sea cucumbers served as 'sea slugs', 'trepang' or 'Beche de mer'. Maldives, Indian Ocean

Georgette Douwma / Edible sea cucumber (Holothuria edulis) extruding sand, Manado, North Sulawesi, Indonesia

Alex Mustard / Donkey dung sea cucumber (Holothuria mexicana) lifting its head up from the sand to spawn in late afternoon, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Pete Oxford / Donkey Dung sea cucumber (Holothuria mexicana)Coral Reef Island, Belize Barrier Reef, Belize

GEORGETTE DOUWMA / Sea cucumber (Holothuria / Halodeima edulis) edible species served as "sea slug", "trepan" or "Beche de Mer". Indonesia.

Georgette Douwma / Beche de Mer sea cucumber (Holothuria / Halodeima edulis) beside a Sea apple (Pseudocolochirus violaceus). Komodo National Park, Indonesia

Jeff Rotman / Wild Bottlenose Dolphins (Tursiops truncatus): mother and calf playing with Sea Cucumber (Holothuria edulis), Nuweiba, Egypt - Red Sea.

Sue Daly / Cotton spinner cucumber {Holothuria forskali} Channel Islands, UK

Juergen Freund / Mass congregation of Black sea cucumbers {Holothuria atra} split level, Cocos Keeling, Indian Ocean, Australia

Doug Allan / Sea cucumberS {Holothuria sp} Antarctica

David Shale / Sorting Holothurians / Sea cucumbers in a benthic sample from the mid-Atlantic ridge

Jose B. Ruiz / Sea cucumber {Holothuria tubulosa} Mediterranean

Jose B. Ruiz / Cotton spinner sea cucumber {Holothuria forskali} Mediterranean

Juergen Freund / Sea cucumber (holothuria edulis) on sea bed. Indo-Pacific ocean

GEORGETTE DOUWMA / Sea cucumber {Holothuria fuscopunctata} Indonesia

Juergen Freund / Black sea cucumbers {Holothuria atra} Cocos Keeling, Australia