Education of the Mind: TIL Turbellarians flatworms mate by penis fencing. Each has two penises on the undersides of their heads which they use to inject sperm.

Saturday, July 15, 2017

TIL Turbellarians flatworms mate by penis fencing. Each has two penises on the undersides of their heads which they use to inject sperm.

http://ift.tt/2terDN9 via /r/todayilearned http://ift.tt/2tWX9N3

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