|A male okapi (Okapia johnstoni), note the horns.|
|A hornless female okapi|
Okapi live in the rainforests of the Democratic Republic of the Condo (formerly Zaire). Their unique appearance acts as effective camouflage in this habitat. In the wild, they are solitary creatures and only come in contact to mate. Outside of this, mothers are very protective of offspring and communicate with them using low frequency sounds in a similar range as elephants. Interestingly enough, the species was completely unknown to the Western world until 1990. Outside of zoos, it is still poorly studied mostly due to its elusive nature. They are currently Near Threatened.
Sources are Animal Diversity Web, IUCN Red List, ARKive, San Diego Zoo, and ADW again. Images are from Wikimedia Commons under Creative Commons licenses: one, two.