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Fred Bavendam

Male reef octopuses, pictured here, can rapidly change from white to red to signal to females that they're ready to mate.

On the ocean floor in Cocos Island, Costa Rica, a red-lipped batfish is much more likely to walk than swim when it looks for prey.

You might think this is a coral. But it's not—it's rather a reef stonefish from Bali, Indonesia that has amazing powers of mimicry.

A sponge crab wears a clear sheet of plastic over its shell in Edithburgh, Australia. Historically, sponge crabs put sponges over their shells to camouflage themselves from predators. This man-made covering is not adequate protection.

A Port Jackson shark swims by in New South Wales.

A reef stonefish mimics a coral reef in Bali, Indonesia.

A Pacific giant octopus scavenges the carcass of a spiny dogfish (Squalus acanthias) off the coast of British Columbia, Canada.