Made of keratin, the same material of which our nails are made of, horns are quite important to an animal.
It serves as a defence against the enemy and digging of soil or tree barks for food. In some cases it has also been found to be helpful in regulating temperature of the animal body.
Even humans like to gather horns. One of the reason is for decorative purposes. Its regarded as a exquisite item to be showcased. Also, in a few cases such as a rhinocerous, the horns have a medicinal value.
Here are some interesting photographs of animals flaunting their horns !