Rhinoceros horns; unlike those of other horned mammals; consist of keratin only and lack a bony core; such as bovine horns. Rhinoceros horns are used in traditional Asian medicine; and for dagger handles in Yemen and Oman. One repeated misconception is that rhinoceros horn in powdered form is used as an aphrodisiac in Traditional Chinese Medicine. It is; in fact; prescribed for fevers and convulsions. China has signed the CITES treaty however. To prevent poaching; in certain areas; rhinos have been tranquilized and their horns removed.