The weapons of speed can be a matter of life and death. For those animals that rely on their speed, it is both a test of their endurance and their judgement in terms of hunting and being hunted. Only the fastest animals on the planet can afford to depend on their speed a wrong move and the predator can become the prey. Similarly, animals that are armed with horns must exercise extreme judgement when wielding their weaponry. Frequently horns are employed by males to intimidate sexual rivals and access females. Even in the world of insects, horns play the same role in mating rituals.