361,900

That’s the number of Western lowland gorillas estimated to have been living in Western Equatorial Africa in 2013, according to new research published in the journal Science Advances. That’s a lot of apes — in fact, it is one-third more gorillas than previously estimated. Unfortunately, gorilla populations are declining faster than was previously understood — three percent per year. At this rate, half the world’s gorillas could be gone by 2040.

— ALEX KINGSBURY