Penguins Are Often Mistaken for Marine Mammals, But They Are Actually Fascinating and Unique Birds

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December 09, 2014 | 18,067 views

Story at-a-glance

  • Penguins are not only adorable little tuxedo-wearing beings, many people don’t realize that penguins are actually birds… though they don’t fly
  • Penguins’ bones are not hollow like other birds
  • There are around 20 different species of penguins and they vary in size from 2 pounds up to 90 pounds
  • Most penguins are monogamous during breeding season, and many species pick a mate for life – both mom and dad have a role in raising their chicks
  • New Zealand’s yellow-eyed penguin is classified as endangered

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