Are penguins really monogamous?

There’s something tender — maybe even romantic — about penguin courtship. After spending months at sea, hunting fish and swimming in the colder waters, the female Adélie penguins (Pygoscelis adeliae) return to the same breeding grounds year after year. Wandering through a bar scene where the males are blowing trumpets and grooming themselves, they ignore advances and head for their mates from the previous season: the males who arrived before the females to tidy up the nest.

These penguins are models of long-term commitment. But are all penguins equally bonded to a single partner throughout their lives?

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