A new study sheds light on the illuminating, sometimes counterintuitive dynamics of mating and how species survive.

Quick Take Scientists have documented same-sex behavior in hundreds of animal species, though it is not considered a required function for specific ecosystem roles. Some researchers suggest that ...

New research reveals older singing male whales are increasingly successful at siring offspring compared to younger males.

In examining the mating rituals of roundworms, researchers uncovered a unique approach to reproduction that maximizes genetic fitness. Sparks fly when a female nematode meets her mate in a Petri dish.

A new study has found that chemical additives in everyday plastic might be stopping – or, at best, interrupting – the reproductive habits of a shrimp-like species that is key to the marine food chain.

Recovering humpback whale populations are revealing a hidden shift: older males are increasingly outcompeting younger rivals to father calves.

The piece of Russian amber allowed scientists to recreate the ancient scene from the past and understand current animal behavior. The fossil, found in Kaliningrad, Russia, is a "unicorn" because it ...