Here are 10 animals that have some of the highest levels of testosterone and the impact it has on their behavior and characteristics.

Older male whales are more successful at mating than their younger rivals because they are better singers, suggests new ...

New humpback whale study shows older male whales were more likely to become fathers and younger males were less likely to do ...

Kakapos, which are reclusive and flightless and can live as long as humans, are found only in New Zealand. They feed on the fruit of the rimu tree.

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

Dog owners are only just learning why some male dogs squat to pee rather than hike their leg up a tree, lamppost, or public ...

As humpback whales recover, older males are fathering more calves, revealing how whaling still shapes mating and competition ...

Have you ever heard two or more women say they’re on the same cycle? This is a common claim among women who live together, for example in a family or as housemates. This idea that people menstruate, ...

New research from the University of St Andrews published in Current Biology has shown that the role of age in male humpback ...

A dog trainer has explained that male dogs lifting their leg to urinate is learned behaviour rather than natural instinct.

Male skunks increase their usual home range from about 1.5 miles to as much as 5 miles during mating season, which is in ...

It trained dolphins, saw celebs fall in tanks and hosted an underwater wedding.