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're the only mammal on earth with a venom mouse bite. dr. nekaris learned that the hard way when one bit her. >> it is not pleasant. like a snake, it can decay and fester and the wound takes quite a long time to heal. >> reporter: it hurts. >> and it throbs, it can throb for days and days and they can bite straight through your fingernail and into the bone. >> reporter: villagers say a lor