Ducks Do It

Two weeks ago I explained how birds manage to have sex. But somehow, there are always those species that make things more complicated. Last week’s explanation applied to 97% of bird species. But a few kinds of birds don’t follow the flock.

Take Cassowaries, for example. Both the male and female have what appears to be a penis attached to their cloacas, although the female’s is somewhat smaller than the male’s. It’s used during copulation, but it doesn’t channel sperm. Instead, after penetrating the female, the male expels his semen directly from his cloaca.

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Flightless Birds

What do the Ostrich, Kiwi, penguin, and Giant Coot have in common? Yes, they’re all birds—but none of them can fly. In fact, there are over 60 species of flightless birds, including all the Ratities (the family that includes the Ostrich, Rhea, Emu, and similar species) and all the penguins (in spite of the evidence in this video):

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