A new study led by the Zoological Society of London [ZSL] and the Wildlife Conservation Society [WCS] has uncovered a dramatic decline in their numbers, with only around 7,100 believed to now exist in the wild. With a historic population of over 100,000 in 1900, the species is clearly now in a fragile state, amid calls for them to be reclassified by the IUCN as endangered. The reasons behind their collapse include:
- Habitat loss, fragmentation and degradation.
- Human-wildlife conflict.
- Loss of prey due to the growing bushmeat trade.
- Illegal pet trade.