BBC footage shows male hippos fighting for dominance, sometimes for hours, in a brutal struggle for mating rights ...

When we think of snakes, we often imagine silent, slithering creatures that prefer to stay out of sight. But during certain times of the year, snakes, especially the males can be aggressive and ...

Male kangaroos fight for dominance and mating rights. This is known as “ritualized fighting.” In the kangaroo world, only the strongest and most intelligent males get to pass on their genes. This is ...