Edwin Giesbers / Two Adelie Penguins {Pygoscelis adeliae} on iceberg, Antarctica

Alex Mustard / A diver exploring a coral reef with formation of brown tube sponges (Agelas conifera) red rope sponges (Amphimedon compressa) and deepwater sea fans (Iciligorgia nodulifera) East End, Grand Cayman, Ca...

Alex Mustard / Red clingfish (Arcos rubiginosus) pair blend in with their host, a deepwater sea fan (Iciligorgia nodulifera) East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Brown tube sponges (Agelas conifera) and deepwater sea fans (Iciligorgia nodulifera) with a diver in background exploring the reef, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbe...

Alex Mustard / Red clingfish (Arcos rubiginosus) living on a deepwater sea fan (Iciligorgia nodulifera) on the reef wall, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Coral reef outcrop with brown tube sponges (Agelas conifera) deepwater sea fans (Iciligorgia nodulifera) and knobby cactus coral (Mycetophyllia aliciae) East End, Grand Cayman, Cayman Islands, Britis...