here's abc's jeffrey kaufman. >> reporter: they arer reistable. tiny creatures with oh, so probes eyes. they look like a furry cartoon character, don't they? few had ever heard of the slow loris until it became an internet sensation on youtube. making millions of people smile. >> first time i've ever seen a loris. oh. so, what are they? we met with one of the world's only slow loris experts, dr. anna nekaris, at one of the few zoos that keeps lorises. the paignton zoo in england. >> this is a species that's found in indo-china. the smallest slow loris. >> reporter: with the biggest eyes i've ever seen. >> it's nocturnal so it needs big eyes to see in the dark and it's shy at the moment. >> reporter: and you don't want me to say this is a super cute animal, do you? >> well, it obviously is very cute and being cute is its downfall. >> reporter: stick with us. we'll explain. bbc and animal planet followed the illusive obscure creatures into the jungles of indonesia with dr. nekaris as she studied them. they're not so cuddly in the wild. in fact, they