in the lab at their research station, lemur feces is analysed.ral ecologist and sociobiologist dr. claudia fichtel measures levels of stress hormones. raised levels indicate that life is tough for the animals. >> it's also an indicator their health is compromised. just as longterm stress affects the health of humans, it affects the health of lemurs and that in turn is important for their red list entries. it takes a lot of time to >> prepare data for the red list. the scientists here are doing that alongside their own research. but they say it is important to establish where each species figures in the various categories of threat. it is a useful indicator of the state of biodiversity. the red lists cover almost 83,000 slant and animal species worldwide. close to 1/3 of them are endangered. there are examples of species once close to extinction that have recovered. peter wants to make sure the lemurs of this forest also stand a chance of surviving. >> and now to chile where we pay a visit to the home of arturo duclos, in global living rooms. ♪ >>