Here's why:
* Difficult to count: Chimpanzees live in dense forests, making it hard to conduct accurate censuses.
* Populations fluctuate: Numbers change due to factors like habitat loss, poaching, and disease outbreaks.
* Two species: There are two species of chimpanzees: common chimpanzees and bonobos. Each has its own population size.
However, estimates suggest that there are around 172,000 to 200,000 chimpanzees left in the wild.
It's important to remember that this is just an estimate, and the actual number could be higher or lower.