savannahlike habitat are more likely to bear horns than small or camouflaged species. In addition, horns may be used to root in the soil or strip bark from trees. In animal courtship many use horns in displays. For example, the male blue wildebeest reams the bark and branches of trees to impress the female and lure her into his territory. Some animals with true horns use them for cooling. The blood vessels in the bony core allow the horns to function as a radiator. After the death of a horned animal, the keratin may be consumed by the larvae of the horn moth. Human uses of horns Horned animals are sometimes hunted so their mounted head or horns can be displayed as a hunting trophy or as decorative objects. Some cultures use bovid horns as musical instruments, for example, the shofar. These have evolved into brass instruments in which, unlike the trumpet, the bore gradually increases in width through most of its length—that is to say, it is conical rather than cylindrical. These are called horns, though now made of metal. Drinking horns are bovid horns removed from the bone core, cleaned, polished, and used as drinking vessels. (This is similar to the legend of the cornucopia.) It has been suggested that the shape of a natural horn was also the model for the rhyton, a horn-shaped drinking vessel. Powder horns were originally bovid horns fitted with lids and carrying straps, used to carry gunpowder. Powder flasks of any material may be referred to as powder horns. Shoehorns were originally made from slices of bovid horn, which provided the right curving shape and a smooth surface. Antelope horns are used in traditional Chinese medicine. Horns consist of keratin, and the term "horn" is used to refer to this material, sometimes including similarly solid keratin from other parts of animals, such as hoofs. Horn may be used as a material in tools, furniture and decoration, among other uses. In these applications, horn is valued for its hardness, and it has given rise to the expression hard as horn. Horn is somewhat thermoplastic and (like tortoiseshell) was formerly used for many purposes where plastic would now be used. Horn may be used to make glue. Horn bows are bows made from a combination of horn, sinew and usually wood. These materials allow more energy to be stored in a short bow than