Hippos have some of the most intense mating and dominance battles in the animal kingdom. To prove themselves to females, ...

You do not want to get on a hippopotamus's bad side — it could be the last thing you do! These huge mammals can become vicious if provoked, and even though they haven't been trained in martial arts, ...

Add Yahoo as a preferred source to see more of our stories on Google. Male hippos must endure multi-hour combat to secure exclusive mating rights within the river. Reaching the 7-year threshold ...