What qualifies as cheating seems to vary between humans and animals.
A species of remarkably faithful penguins may have found the secret to monogamy -- plenty of time spent very far apart.
Males with the cheek-padding feature on their faces have better success at reproducing, a new study suggests.
Sex between animals with multiple arms and suckers is perhaps as intense, and romantic, as it gets in the animal kingdom.
Male wolf spiders learn how to copy each others' dance routines to impress the female set.
It's hard to imagine a shark that works harder for love than the glowing, grooving velvet belly lanternshark.
No mate? No problem for a free-living flatworm that shoots sperm into its head to fertilize itself. Continue reading →
A song produced by male nightingales communicates dad skills to attentive, listening females.
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