Okapis inhabit canopy forests at altitudes of . As its name implies, the Okapi Wildlife Reserve is home to many okapis. Six guards and other staff as well as 14 okapis were killed in the incident. Around 100 okapis are in accredited Association of Zoos and Aquariums (AZA) zoos. The reserve is home to about 5,000 okapis, 4,000 elephants, 2,000 leopards, chimpanzees, and crocodiles. Male okapis have short, hair-covered horns called ossicones, less than in length. Okapis often rub their necks against trees, leaving a brown exudate. Many zoos in North America and Europe currently have okapis in captivity. Okapis are primarily diurnal, but may be active for a few hours in darkness. Okapis are herbivores, feeding on tree leaves and buds, grasses, ferns, fruits, and fungi.