00:00You won't believe what this animal can survive.
00:03Great kiskadees twitch their vocal muscles while sleeping,
00:07just like dogs paddle their paws.
00:09But here's the crazy part.
00:11Scientists think they're actually practicing songs
00:14or rehearsing territorial fights in their dreams.
00:17This bird is literally training for battle while unconscious.
00:21Evolution is absolutely wild.
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