00:00Nature just broke the rules again.
00:02Great Kiskadees literally practice their songs while they're sleeping.
00:06Their vocal muscles twitch uncontrollably, like they're fighting invisible enemies.
00:11Scientists think they're rehearsing territorial battles in their dreams.
00:15Imagine having to practice your screams, even when unconscious.
00:19This bird doesn't clock out, ever.
00:21Its brain is literally grinding, 24-7.
00:24Follow for more insane animal facts.
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