Paul Williams / Ochre starfish (Pisaster ochraceus) Goose barnacles (Pollicipes polymerus) California mussel (Mytilus californianus) and Giant green anenome (Anthopleura xanthogrammica) in rock pool, Vancouver Island...

Paul Williams / Ochre starfish (Pisaster ochraceus), Goose barnacles (Pollicipes polymerus) and California mussel (Mytilus californianus) in rock pool, Vancouver Island, British Columbia, Canada, July.

Paul Williams / Ochre starfish (Pisaster ochraceus) California mussel (Mytilus californianus) and Giant green anenome (Anthopleura xanthogrammica) in rock pool, Vancouver Island, British Columbia, Canada. July.

Alex Mustard / Purple sea star (Pisaster ochraceus) resting on a barnacle covered rock, beneath pine trees, Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Lynn M. Stone / Ochre sea stars (Pisaster ochraceus) clinging to barnacle-encrusted rock at low tide, Lone Ranch Beach, Brookings, Oregon, USA. July.

Lynn M. Stone / Ochre sea stars (Pisaster ochraceus) on rock at low tide, Lone Ranch Beach, Oregon, USA. July.

Georgette Douwma / Ochre sea star (Pisaster ochraceus) on black background, Olympic National Park, Washington, USA, Pacific Ocean.

Shane Gross / Ochre sea star (Pisaster ochraceus) boiled to death on the shore. The victim of a heat wave (due to climate change) coinciding with extremely low tides in the middle of the day, Vancouver Island, Brit...

David Hall / Ochre and purple sea stars (Pisaster ochraceus); North Wall, Nigei Island, Queen Charlotte Strait, British Columbia, Canada. October.

David Hall / Purple and Ochre sea stars (Pisaster ochraceus) preying on Pacific blue mussels (Mytilus trossulus). Also seen are Green Surf Anemones (Anthopleura xanthogrammica), Short Plumose Anemones (Metridium s...

David Hall / Purple and Ochre sea stars (Pisaster ochraceus) and Green surf Anemones (Anthopleura xanthogrammica). Browning Pass, Queen Charlotte Strait, British Columbia, Canada. September.