Jeff Rotman / Wolf eel (Anarrichthys ocellatus) eating Red Sea Urchin (Strongylocentrotus franciscanus). Queen Charlotte Strait, British Columbia, Canada, North Pacific Ocean.

Jeff Rotman / Wolf eel (Anarrichthys ocellatus) eating Red Sea Urchin (Strongylocentrotus franciscanus). Queen Charlotte Strait, British Columbia, Canada, North Pacific Ocean.

Norbert Wu / Red Sea Urchin (Strongylocentrotus franciscanus) and brittlestars, Campbell River, Vancouver Island, British Columbia, Canada

Fred Bavendam / Sea Star (Mediaster aequalis), California Sea Cucumber (Parastichopus californicus) and Red Sea Urchin (Strongylocentrotus franciscanus), British Columbia, Canada

Fred Bavendam / Red Sea Urchin (Strongylocentrotus franciscanus) in urchin barren, Vancouver Island, British Columbia, Canada

Doug Perrine / Spiny / Piked dogfish {Squalus acanthias} with Red sea urchins {Strongylocentrotus franciscanus} Quadra Island off Vancouver Island, Discovery Passage, British Columbia, Canada. Note - also known as...

Doug Perrine / Spiny / Piked dogfish {Squalus acanthias} with Red sea urchins {Strongylocentrotus franciscanus} and orange sea pen {Ptilosarcus gurneyi} Quadra Island off Vancouver Island, Discovery Passage, British...

Doug Perrine / Spiny / Piked dogfish {Squalus acanthias} with Red sea urchins {Strongylocentrotus franciscanus} Quadra Island off Vancouver Island, Discovery Passage, British Columbia, Canada. Note - also known as...

Norbert Wu / White Sea Urchin (Lytechinus anamesus) group attack and feed on a larger Red Sea Urchin (Strongylocentrotus franciscanus), southern California

Richard Herrmann / Red Sea Urchin (Strongylocentrotus franciscanus) group feeding on Giant Kelp (Macrocystis pyrifera) creating urchin barren, Santa Cruz Island, Channel Islands, California

Shane Gross / Red sea urchins (Strongylocentrotus franciscanus) gathered on the seabed, Barkley Sound, Vancouver Island, British Columbia, Canada.

Shane Gross / Purple sea urchins (Strongylocentrotus purpuratus) and Red sea urchins (Strongylocentrotus franciscanus) on seabed, Barkley Sound, Vancouver Island, British Columbia, Canada.