Sea Butterfly photographed by Ingo Arndt. Tiny marine shelless snails known as sea butterflies take many forms, including heart-shaped, such as this species in Antarctica's Weddell Sea. via National Geographic
Crabs in Glass Houses.Scientists at the New Zealand Marine Studies Centre placed glass shells into a hermit crab tank. The crabs moved into the glass shells shortly after, allowing scientists to study the crabs.
Rare deep-sea fish pictured Many deep sea fish display a show of spectacular colors, known as bioluminescence. Light is created when the ( protien or bacteria can't remember which pretty sure protien) Lucifern is broken Down.