University of California, Berkeley, herpetologist Jim McGuire was slogging through the rain forests of Indonesia's Sulawesi Island one night this past summer when he grabbed what he thought was a male ...

For many fish species today, copulation is a hands-off affair. Females release a torrent of eggs into the water, and males douse the eggs in a cloud of sperm. This seems like a pretty basic way of ...

The history of sex may have to be rewritten thanks to a group of unsightly, long-extinct fish called placoderms. A careful study of fossils of these armour-plated creatures, which gave rise to all ...

"In species with internal fertilization -- like mammals, birds and insects -- sperm fertilize eggs inside the female's body, while in species with external fertilization -- like sea urchins and many ...

Sex is an ancient tradition. It’s older than today’s continents, older than dinosaurs, older than trees, dating back to a time when vertebrate life thrived in the seas but had not yet ventured onto ...

Evidence of bony organs in ancient, armour-plated fish suggests that they copulated even though many of their descendants stopped doing so. The history of sex may have to be rewritten thanks to a ...