00:00Scientists can't explain how this animal does this.
00:03The male wood duck has a penis that spirals like a corkscrew.
00:07It can extend and retract in milliseconds.
00:10His reproductive organ is longer than his entire body, even wilder.
00:15The female's reproductive tract spirals the opposite direction.
00:18It's an evolutionary arms race happening inside her body.
00:22Nature literally designed them to battle each other.
00:25This is one of nature's most bizarre adaptations.
00:27Save this and share with an animal lover.
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