Add Yahoo as a preferred source to see more of our stories on Google. Southern Elephant Seal (Mirounga leonina) fights with a rival for control of a large harem of females during the breeding season ...

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

Much of the eastern United States is currently undergoing a massive polar vortex, with another one expected to follow. Meanwhile, California basks in the sunshine. These conditions set the stage for ...