Which external component can be used for defense?

Horns serve a vital role in defense for many animals, particularly those in the wild. They are often used in combat against predators or rival males during mating season, providing not only a physical barrier but also a means of delivering powerful blows. The structure and strength of horns vary significantly between species, but they generally have a hard exterior that can inflict damage, making them an effective deterrent against threats. This defensive capability is seen in various animals, such as deer, goats, and rhinoceroses. In contrast, while tusks, fur, and whiskers may serve other purposes—like foraging, insulation, or sensory perception—they do not provide the same level of protection and defense as horns do.