Are zebra horns made of ivory?

The material in elephant tusks is called ivory, and these tusks grow as the animal grows. The ivory is formed from the dentine of the elephant, and also from that of the hippo, the walrus, the narwhal, and the now-extinct mammoth.

Ivory has been used for a number of decorative purposes. It has been carved into beads, buttons and a wide variety of ornaments. Ivory has been used for billiard balls, piano keys and a thousands of other items over many centuries.

Trade in ivory is becoming more and more regulated as governments and conservation organizations move to protect the dwindling number of elephants. (This though poachers still take a number of elephants every year.) In addition, technology has given us plastics in myriad types, and these synthetic materials can be substituted for ivory is almost any application. Contemporary materials perform equally well or better than ivory through nearly all applications.