David Fleetham / Close up of underside of Panamic cushion star (Pentaceraster cumungi), Galapagos Islands, Ecuador.

Alex Mustard / California sea lion (Zalophus californianus) uses a Panamic cushion star (Pentaceraster cumingi) as a toy. The sealions pick up the starfish and then drop them and chase after them as they sink. Los I...

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.

Claudio Contreras / Cushion sea star (Oreaster reticulatus) on Turtle grass (Thalassia testudinum) Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, July

Alex Mustard / California sea lion pup (Zalophus californianus) practicings its hunting skills by playing chase with a falling sea star (Panamic cushion star: Pentacerster cumingi). Los Islotes, La Paz, Baja Califor...

David Fleetham / Reticulated brittle star (Ophiocoma brevipes) on cushion starfish (Culcita novaeguineae), Hawaii.

David Fleetham / Reticulated brittle star (Ophiocoma brevipes), and commensal shrimp (Periclemenes soror) on a cushion starfish (Culcita novaeguineae), Hawaii.

Alex Mustard / California sea lion (Zalophus californianus) using a Panamic cushion star (Pentaceraster cumingi) as a toy. The sealions pick up the starfish and then drop them and chase after them as they sink. Los...

Sue Daly / Cushion Star (Ceramaster granularis), Trondheimsfjord, Norway, July.

Georgette Douwma / Honeycomb / Cushion starfish (Pentaceraster alveolatus) Malapascua Island, Philippines, September

Georgette Douwma / Honeycomb / Cushion starfish (Pentaceraster alveolatus) Malapascua Island, Philippines, September