Georgette Douwma / Blue starfish (Linckia laevigata) Malaysia.

Chadden Hunter / Brinicles (brine icicles or ice stalactites) forming under the ice, growing towards the sea floor, Ross Sea, McMurdo Sound, Antarctica. Taken on location for 'Winter' episode of the BBC Frozen Planet...

Juergen Freund / Blue sea star on massive Boulder coral (Gardineroseris planulata) North Sulawesi, Indonesia. This coral species is normally found from the Red Sea to Central America, and is relatively uncommon in the...

Juergen Freund / Coral reef landscape with abundant whip corals, Blue sea stars and hard coral, North Sulawesi, Indonesia, October 2009.

Juergen Freund / Massive boulder / Cauliflower coral (Gardineroseris planulata) with blue sea star, Buyat Bay, Sulawesi, Indonesia, Indo-pacific.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Blue linkia starfish (Linckia laevigata) pair attached to the dead part of coral, New Ireland, Papua New Guinea

Juergen Freund / Blue starfish shrimp (Periclimenes soror) on starfish, Kimbe Bay, Papua New Guinea, Indo-Pacific.

Juergen Freund / A small Necklace sea star (Fromia monilis) on larger Blue sea star (Linckia laevigata) Sipadan, Malaysia

Alex Mustard / A young California sealion (Zalophus californianus) playing with a starfish, inside an underwater cave. The pups will pick up a variety of objects (such as starfish, lumps of coral, shells and feather...

Juergen Freund / Horned sea stars {Protoreaster nodosus} in shallow water, Indo-Pacific