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Why do birds have penises in the form of a cork screw?

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closed as off-topic by Bryan Krause May 13 at 1:20

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  • "Homework questions are off-topic on Biology unless you have shown your attempt at an answer. For more information see our homework policy." – Bryan Krause
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  • $\begingroup$ Please use a proper vocabulary. "balls" is a slang. Also, balls refer to the testicles, not to the penis. $\endgroup$ – Remi.b May 13 at 6:17
  • $\begingroup$ to get the corks out of milkbottles? $\endgroup$ – user1136 May 14 at 19:16

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