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Emperor penguins at rookery; chicks call to parents for food; parents can recognize chick's call among 50,000 birds.

Emperor penguins may walk 100 miles to reach a rookery; Antarctica.

Emperor penguins; calls are used to recognize each other and form pairs for mating, Antarctica.

A lone Adelie penguin in a group of Emperor penguins, Antarctica.

Emperor penguins swimming quickly with bubble trail, Antarctica.

Emperor penguins can dive to 600m and stay down for 20 minutes; Antarctica.

Emperor penguins can dive to 600m and stay down for 20 minutes; Antarctica.

Emperor and Adelie penguins appear at the ice edge each spring and work their way inland to rookeries. Emperor penguins endure the most extreme conditions known on earth. They return to their breeding colonies in March through early April,…

Skin of female Bicolor Parrotfish (Cetoscarus Bicolor). Red Sea.

Queen Angelfish (Holacanthus Ciliaris) Bahamas - Carribbean.