Georgette Douwma / Burrowing sea cucumber (Neothyonidium magnum). The massive tentacular crown is the only part that is visible, the rest is buried in the sand. Feeds by picking particles out of the water with the tenta...

Jeff Rotman / Scarlet Psolus Sea Cucumber (Psolus fabricii), feeding with arm in mouth. Bay of Fundy, Canada, Atlantic Ocean.

Constantinos Petrinos / Harlequin crab on Sea cucumber {Lissocarcinus orbicularis} Sulawesi, Indonesia

Fred Bavendam / Leopard Sea Cucumber (Bohadschia argus) ejects a mass of long white sticky cuvierian tubules as a defense when disturbed, Manado, Indonesia

Fred Bavendam / California Sea Cucumber (Parastichopus californicus) underwater, Vancouver Island, British Columbia, Canada

Jeff Rotman / Bottlenose dolphin (Tursiops truncatus) plays with sea cucumber, Red Sea

Georgette Douwma / Kaleidoscopic image of Sea apple (Pseudocolochirus violaceus). Komodo National Park, Indonesia.

Tony Wu / Japanese sea cucumber (Apostichopus japonicus), rare albino. Hokkaido, Japan. May.

Georgette Douwma / Emperor shrimp (Periclemenes imperator) on a Sea Cucumber. West Papua, Indonesia. Indo-West Pacific.

Georgette Douwma / Lampert's sea cucumber (Synaptia lamperti) group feeding, North Sulawesi, Indonesia.

Georgette Douwma / Candycane sea cucumber (Thelenota rubralineata). North Sulawesi, Indonesia.

Georgette Douwma / Candycane sea cucumber (Thelenota rubralineata) detail. North Sulawesi, Indonesia.