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Why some animals have a penis bone shaped like an ice-cream scooperIt could scoop out sperm from competitors.
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Evolution turned this fish into a 'penis with a heart.' Here's how.Anglerfish are literally missing part of their immune system, but this allows them to permanently fuse during sex, new research suggests
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Seabird-eating 'monster' crabs are chatty during sexEnormous and powerful coconut crabs are known for their extreme size. They also have an unexpectedly diverse "vocabulary."
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Was Same-Sex Behavior Hardwired in Animals from the Beginning?Same-sex sexual behavior might have started out on an equal footing with different-sex sex.
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This Fish Just Gave Evolution the Finger and Got PregnantMary's species of fish never evolved to have sex or incubate live young. She did it anyway.
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Animal Sex: How Meerkats Do ItMeerkats are anything but meek — including when it comes to their mating behaviors.
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Animal Sex: How Red-Eared Sliders Do ItRed-eared slider reproduction involves large claws, extra-long penises and numbers of eggs.
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Animal Sex: How Western Toads Do ItWestern toad sex involves quiet searches, mating balls and streams of eggs.
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Animal Sex: How Narwhals Do ItLittle is known about the mating behaviors of arctic-loving narwhals, also called the unicorns of the sea.
