Source: Esin Üstün, via Flickr. Distributed under a CC BY 2.0 license. Decades of research have emphasized the importance of matriarchs in leading elephant herds. A herd, made up of related female ...

My colleagues, students, volunteers and I were at Mushara, a remote water source in Namibia’s Etosha National Park, to study the dynamics of an all-male society, bull elephant style. I’d been coming ...

THIS is the dramatic moment park rangers have a life-or-death battle to save a stricken elephant from an agonisingly slow ...

The bull elephants gather in the evening coolness to drink. After a spell, a senior male lifts his head and turns from the waterhole. With ears flapping gently, he lets out a deep, resonant rumble.

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