Train, aka Mr. T or Big Brown Monster, has made four trips to Misiones, Argentina, a rugged and rainy province with an economy that relies primarily on agriculture and logging, as well as some tourism. He’s not a sightseer – at least not in the usual way. Train detects the scat, or feces, of jaguar, puma, ocelot, oncilla and bush dog. What he finds helps Washington University researchers analyze the paths the animals travel. This allows them to plan habitat corridors that protect the ability of wildlife to travel through territory while limiting their impact on surrounding environments, which include public and private wildlife reserves, privately owned plantations and farms, and roads and pathways.