Back in 2012, a baby brownbanded bamboo shark was born in tank even though the mother hadn't been exposed to a male for 45 months. Scientists have now figured out how this so-called "virgin birth" was possible.
A recent analysis of placoderm fossils — an early jawed vertebrate — shows that the animal kingdom's first genital organ was a "clasper" that evolved from an extra set of legs, and that the first sexual mating position was likely to have been a missionary one.
It's not uncommon for males of various species to physically battle it out in an effort to win over females. But plants, because they can't move or fully sense their environment, don't partake in this reproductive process. Well, at least that's what we thought.
Sexual reproduction that involves two partners is far less efficient than self-fertilization — at least, from the perspective of evolution. So why did creatures like humans ever start having sex with each other? According to a new study, we did it to fight parasites. We spoke with the researchers to discover what…
When a pair of freshwater fish species reproduce together, they create hybrids who are able to reproduce asexually. This ability should offer the hybrids an unstoppable evolutionary advantage...so why aren't we bowing down before our asexual fish hybrid masters?
The embryos of a male and female twin can sometimes fuse into a single fetus with both male and female sexual organs. Now an imaginative biologist has figured out how this could lead to conceiving a son without a father.