hien, where do you rescue the langurs from?re native to this part of vietnam. some of them are learning how to be wild again after surviving human entrapment. whistle blows hien does a daily check—up to make sure they're doing all right. monkey peeps whistle blows whispering: this is the only human contact that these langurs have every day. the delacour�*s langur is only found in vietnam, and there are fewer than 300 of them in the wild. that makes them critically endangered. hien takes me to the wetlands where langurs still live in their natural habitat. quietly: 0h. whispering: we can hear them now. yeah, yeah. i definitely hear one. you see? over here. ah! whispers: yeah. yeah. yeah, yeah, yeah. yeah. 0h. green tree. yeah, yeah, yeah. they move so fast. isee... i see more one. one. 0h, he's so well hidden. yeah. there are four of them now. they've moved from the cave into the trees. here comes another one. they look like little panda bears on the rocks. you get a sense of how agile they are, but also how delicate they are. s