"Wouldn't evolution "side with" the system that produces more offspring," Sperm is not in short supply. There's a huge investment made in raising offspring. read more
"Wouldn't evolution "side with" the system that produces more offspring," Sperm is not in short supply. There's a huge investment made in raising offspring. read more
At some point in the species' history, female ruddy ducks decided blue bills were sexy, and evolution favored the flamboyant feature. But evolution just as carefully selected another extravagant male trait, which, at the time, was hidden: a long, corkscrew-shaped penis. read more
Duck sex is far more interesting than it has any right to be, due to the twisted nature of the birds' genitals. Male and female ducks have corkscrew-shaped sex organs which spiral in different directions. read more