reporter: veterinarian andhani hartanti is going to check dora over.ot ononly has she b been losg weightht, she's alsoso been hag difffficulties clilimbing -- probablyly because shehe w ina fight t with anotherer orangan d isis injured. andhan abobouthree weeks ago, e of o o staffouound her already on the groun d ththey spect t thadora susuffers something, or a probl. and we knenew that the r rightt has an opepen wound, deeeep enh so we need t to stitch so o then can healal. mainininlowland rainfores ---- and d e of the last remaininin sanctuaries for orgutata. peter: if orangutans can survive hehere, en tigiger elephanan, and d all the otheher animals l be aututomatically p protected,. that's why it's so important to preseserve what wewe have here.. rereporter: peteter and andhanai cocontinue to obobserve the orangutans t they release e inte wild foror at least twtwo yea. e project will only be nsnsidered sucuccessf thee animals have offspri. peter:ur hope that e population here will become so large that the orangutans can susuive on their own and rep

reporter: veterinarian andhani hartanti is going to check dora over. t only has she been losing weight, she's also been having difficulties climbing -- probably because she was in a fight with another orangutan and is injured. andhani: about three weeks ago, one of our staff found her already on the ground. and they suspect that dora suffers something, or a problem. and we knew that the right foot has an open wound, deep enough so we need to stitch so the skin can heal. remaining lowland rainforests -- and one of the last remaining sanctuaries for orangutans. peter: if orangutans can survive here, then tigers, elephants, and all the other animals will be automatically protected, too. that's why it's so important to preserve what we have here. reporter: peter and andhani continue to observe the orangutans they release into the wild for at least two years. the project will only be considered a success if the animals have offspring. peter: our hope is that the population here will become so large that the orangutans can survive on their own and reproduce,