Bonobo share 98.7% of our DNA, equal to our more famous cousins, chimpanzees. But unlike chimps, we know hardly anything about them. Part of the reason for this is that there's been civil war in the Democratic Republic of Congo for the last 10 years and bonobos don't live anywhere else. The other reason is that to see wild bonobos, you have to be prepared to canoe for 4 days up the Congo River through malaria infested swamps.
You can follow Wood's adventures and research (with videos) on her blog Bonobo Handshake. Link -via Metafilter
...Whoops! I googled bonobos before posting this. They ARE on the endangered species list in spite of their inaccessibility!
(Pan paniscus and Pan troglodytes, respectively)