Huge chimpanzee population thriving in remote Congo forest
theguardian.com
theguardian.com
And eating leopard! Are we sure we want to mess with them? We're going to find some poacher sometime soon stumbling out of the Bili forest, mumbling psychotically and covered in his friends' blood.
I'm not sure if just "Democratic Congolese" works. And "Republican Congolese" or simply "Congolese" is probably best reserved for the smaller country bordering on the west, since it's named Republic of Congo. But really, I think citizens of both countries can pretty much share the title of "Congolese" in terms of ethnicity, wherever applicable. Their current borders and formalized names have only persisted since the late 90's.
Sorry, couldn't help it.