Why don't all birds fly? - Livescience.com

  • Clarissa Brincat |
  • Technology |
  • Live Science |
  • 03-23-2025 |
  • 18

Birds are often associated with flight, but not all of them take to the skies. Around 60 species — fewer than 1% of all bird species — are flightless, including ostriches, penguins and kiwis. These…

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