Here's one big reason why the bonobos are in trouble
Quoting from here:
http://en.wikipedia.org/wiki/Bonobo
Around 10,000 Bonobos are found only in the humid forests south of the Zaire River, in the Democratic Republic of Congo of central Africa. They are an endangered species, due to both habitat loss and hunting for "bushmeat", the latter activity having waxed dramatically during the current civil war due to the presence of heavily armed militias even in remote "protected" areas such as Salonga National Park. Today, at most several thousand Bonobos remain. This is part of a more general trend of ape extinction.