MinuteEarth

Why Bird Penises Are So Weird

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To learn more about this topic, start your googling with these keywords:

  • Sex chromosome: A chromosome involved in determining the sex of an individual.
  • Cloaca: A posterior orifice that serves as the only exit for the gastrointestinal, urinary and genital tracts.
  • Mutation: An alteration in the DNA sequence that makes up a gene.
  • Sexually-selected Trait: A trait based on a mutation that confers a reproductive advantage.
  • BMP4: A protein whose presence halts the growth of bird penises in the egg.


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