Mount Nyamulagira, 25km (16 miles) from the eastern city of Goma, erupted at dawn on Saturday, sending lava into the surrounding Virunga National Park.
About 40 endangered chimpanzees and other animals live in the area.
But the country's famous critically endangered mountain gorillas are said to be safe as they live further east.
These are very special chimpanzees. I believe I've blogged about them elsewhere, but I'll write new something about them soon.
I've driven though this range of volcanoes, and flown over them as well.
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Guest post by Brian Hare, Evolutionary Anthropologist at Duke University
The story of 'How we know where HIV-1 came from' is really cool-- A group of researchers went into the jungles of Africa, collected lots of monkey poop, and figured out pretty much the exact colony of chimpanzees that
I know that a bunch of other people covered this story, but I managed to find a video of it so I thought I would post it anyway.