Are penguins really monogamous?

There’s something tender about penguin courtship—maybe even romantic. After spending months at sea chasing fish and swimming in the coldest waters, female Adélie penguins (Pygoscelis Adeliae) slither back to the same nesting sites year after year. As they waddle through a bar scene where the males play trumpets and preen, they ignore the advances and make their way to their pals from last season: the males who arrived before the females to clean up their nest.

These penguins are paragons of long-term commitment. But are all penguins equally attached to a single mate throughout their lives?

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