allaboutgeorge + sex + bir   1

In Ducks, War of the Sexes Plays Out in the Evolution of Genitalia - New York Times
"Once they choose a male, they’re making the best possible choice, and that’s the male they want siring their offspring. They don’t want the guy flying in from who knows where. It makes sense that they would develop a defense."
sex  fauna  animals  bir  evolution  nature  environment 
may 2007 by allaboutgeorge

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