Male giraffes are called bulls, while female giraffes are called cows. Giraffe bulls are larger than giraffe cows; they are generally around 20 feet tall and weigh up to 4,200 pounds. Giraffe cows are usually at least 2 feet shorter and weigh 1,400 pounds less than the males.
Both giraffe bulls and cows grow skin-covered horn-like bulges on their skulls, although males often grow one more pair than females. The males use these during sparring matches where they compete for mating access to females. One bull mates with several cows and will carefully defend any fertile cows from other bulls.