You've no doubt heard that semen is nutritious, but it seems we're not the only species aware of nature's dirty little secret. Scientists have discovered that female southern bottletail squid readily — and consistently — consume the ejaculates and sperm of their mates.

A number of species engage in swarming behavior, where countless individuals move en masse in some direction. But they're not the only ones. Scientists have now found that the sperm of some squid form swarms, and this peculiar behavior could help the cells to fertilize eggs.

Evolution seems to know no bounds when it comes to shaping organisms in a way that's meant to help them survive and reproduce — a process that often leads to some pretty bizarre characteristics and behaviors. And now, thanks to the work of biologists Niclas Kolm and Göran Arnqvist, we can add another example to the…

It's rare to find fossils of animals doing anything other than, well, dying. Sure, occasionally we'll find a brooding mother with her eggs, or animals locked in mortal combat — but the vast majority of fossilized remains are simply in the midst of their death throes.

An Australian photographer claims to have snapped the world's first photograph of humpback whales making love. We can call it that now — love making, that is — based on the detailed description provided by Jason Edwards, who captured the moment off the coast of Tonga.

Male splitfins wriggle about the yellow streak on their tail as part of their mating dance. Females are attracted to the wriggling tail because it looks like their typical prey. There's only one problem: the females then forget to eat.

No, seriously. The next time you find yourself at an ostrich ranch (yes, they exist, and yes, they are everything you ever dreamed they could be and more), there's a pretty decent chance of you getting hit on by an ostrich.

If you're walking in the woods, you're probably going to get more annoyed by a loud, screeching bird call than a soft, complex birdsong. But dark-eyed juncos are just the opposite. These birds will find and fight their soft-singing peers.

Sociological research! Sometimes it involves staring at women's chests. Indeed, a recent study of 128 heterosexual Polish men has divined that fellows who are less interested in long-term relationships are more enthused by larger breasts.

Rove beetles have come up with a truly novel way to ensure monogamy. After a male has mated with a female, he injects her with a chemical that makes her smell so bad that all other prospective suitors stay away.