30 Strangest Animal Mating Habits.

Neatorama has a good breakdown of the 30 strangest animal mating habits. Nothing like an Argentine Lake Duck to make you feel inadequate:

University of Alaska Kevin McCracken explains that the ducks are promiscuous, and the long penis may be an evolutionary adaptation for the males to become more attractive to the females. That, and the drake also uses his penis to “lasso” a female who tries to escape from it.

From here.
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