Nails, claws and hoofs g-row from the nail bed located in the epidermis at the distal part of the phalanges. In ungulates, the nail is highly cornified, whereas in clawed animals the nail is elongated and thickened for defense. Horns and antlers are different from each other. Horns are supported by a bony structure growing out from the skull. Surrounding the bony core is highly keratinized layer of the epidermis.
Horns are generally permanent.
Antlers, on the other hand, are not present throughout the year, and are shed during the non-breeding season. They have a protective covering of skin that is called velvet, which is lost as the antlers mature. Rhinoceros horns are simply hairlike keratin fibers that are woven together without a bony core. Any cell that provides pigment to the skin is called a chromatophore. Chromatophores, as you may remember, are derived from neural crest cells that break off from the ectoderm during neural tube formation.