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Episode Markers
  • 01:47
     
    #counter current exchange system   
    Using a counter current exchange system, some birds can submerge their feet in ice cold water for hours at a time without real consequence.
  • 03:00
     
    #cut off the flow of blood completely   
    In extreme circumstances, some can even cut off the flow of blood completely, though only for a short time without damage.

Why Don't Birds' Legs Freeze

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