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Horns are growths that protrude from the skulls of some animals. Horns are made of two components: 1) bone and 2) keratin. The bone is the center, or core, of the horn and is fused to the bone of the skull. The bone core is covered by a resilient sheath (protective covering) made of keratin.s already stated horns are permanent growths made of bone and keratin, they do not branch out, and are found on animals belonging to the family Bovidae (Bovids). Nature, however, can be both curious and complicated. In the case of what defines a horn, the American Pronghorn Antelope is an interesting exception.
The structure of the rhino horns is similar to a pencilâs tough lead core and weaker wood periphery, which allows the horns to be honed to a sharp point. Thus, the horn is not simply a clump of modified hair and most closely resembles the structure of horsesâ hoofs, turtle beaks and cockatoo bills. The study also found that the melanin and calcium patches appear in yearly growth surges but the effects of temperature, diet and stress on the growth are still unknown.