a by invisible river that flows through the sky. starts march 23rd on d w. ah, ah, mountain gorillas have been on the brink of extinction, but are the only primates currently increasing in number? reaching the milestone, 1000 gorillas has been remarkable. so it s extremely good news. but while the mountain gorilla population increases, what happens when their habitat does not grow with them? that book is that thought there are far more cases of guerrilla groups attacking each other than there used to be with fatalities on a regular basis. yeah. your us, this is something from one into group faith and that is, i think one thing we wanted to know whether the stress levels are increasing. if we don t like to know, we at risk of not being able to do it in 10 years, for example, from now. conservationists and scientists face a growing number of challenges and questions. what s our goal? 801502000 guerrillas. is it still a wild population, or when does it become a wild? do? oh, the