<p>Gentoo penguins have plenty to be apprehensive about when entering Antarctica's frigid waters. To reach the summer's bounty of fish, squid and krill, they often must negotiate a phalanx of hungry sea leopards.</p>

Gentoo Penguin

Gentoo penguins have plenty to be apprehensive about when entering Antarctica's frigid waters. To reach the summer's bounty of fish, squid and krill, they often must negotiate a phalanx of hungry sea leopards.

Photograph by Paul Nicklen, National Geographic

Seabirds

As at home on the water as they are on land, these birds can list swimming, diving, and fishing on their impressive avian resumes.

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