dr. wright chose to study lemurs is their social system.roving families the females are in charge. >> they decide where the whole group goes, which fruit trees they're going to go in, and they go first and eat the best. >> reporter: these omnivores eat most anything including bamboo stalks, which are full of cyanide, easy enough to kill a person but no effect on the lemur. dr. wright's team is studying how they're able to digest such a powerful toxin. >> these golden bamboo lemurs like to hang out at the top of the canopy. they're easy to spot because you have the bits they don't want falling to the floor. >> reporter: at night -- >> we're cheating a bit and rubbing bananas on trees, that's like crack to mouse lemurs. >> reporter: the smallest primate in the world. >> how can you see anything? it's pitch black. >> see there? >> oh, yeah, there it is. sure enough, going straight for the banana. >> reporter: mouse lemurs are known to get the same diseases we do, alzheimer's, diabetes, and obesity, making them crucial to study. on this night t

dr. wright discovered here in 1986.ia: there's only 500 of these in the wild in the whole world. >> anthony: wow, really? what's the biggest pressure on the population? >> patricia: slash and burn agriculture. some places they're hunted. >> darren: here, no, this guy. >> patricia: oh. he is, oh, look at it. oh, how beautiful. oh, that's so nice. oh. >> darren: whoa. he's pissing on you, tom. he's taking a leak right now. >> patricia: yeah, watch. >> anthony: hopefully it's not an editorial statement. >> darren: yeah. [ laughter ] >> patricia: look, this is the kind of bamboo shoot that the lemurs love. it's full of protein and it's full of cyanide. >> anthony: is the cyanide not a problem for them? >> patricia: they can tolerate all kinds of cyanide. the cyanide comes straight through in the, uh, poop. >> darren: do they know how they get it through their system? >> patricia: we're working on that. >> darren: okay. what is the dew on the outside of it? just dew? >> patricia: ah, careful. >> darren: oh don't touch. >> pa

dr. patricia wright is an american primatologist and has dedicated her life to studying lemurs. >> this iszing. there are three of them together a meter from us. >> reporter: we interrupted their post-lunch grooming session. too closer for comfort as two scampered away. the third settling in for a nap. >> so regal. crossing his arms and legs like that. completely relaxed. 15 of the more than 100 species of lemurs live in this forest. many critically endangered including the black and white roughed lemur hasn't been seen, in months by the guides but just been spotted watching an hour's long pursuit. >> we are earning this lemur. then. 60 feet off the ground. there they were. leaping. hanging by their tiny, powerful feet. scarfing down lunch. at night the littlest ones emerge. we are cheating and rubbing bananas on the trees. bananas are like crack to mouse lemurs. the smallest primate in the world. how can you see anything? it's pitch black. >> can you see, there. >> reporter: oh, yeah, there it is. sure enough going straight for the banana. mouse lemurs are then to get alzheimers, diabetes

dr. wright shows enthusiasm of a tourist visiting for the first time. >> the rain forest is an amazing playave been here for 30 years. i still don't know what will happen when i go out there. >> reporter: for "nightline," i'm alex marquardt in madagascar. >> oh, my. >> fascinating. >> i had a lemur on me in an animal demonstration. it's fun. >> who its cuter, alex the lemur or alex the correspondent? >> the lemur was cute. >> did you see the dimples on alex? >> good point. when heartburn hits, fight back fast with tums smoothies. it starts dissolving the instant it touches your tongue. and neutralizes stomach acid at the source. ♪ tum -tum -tum -tum smoothies! only from tums my swthis scarf all thatsara. left to remem... what! she washed this like a month ago the long lasting scent of gain flings with tampax pearl. you get ultimate protection on your heaviest days and smooth removal for your lightest. tampax pearl and pocket pearl for on the go. you knmegared omega-3s... but did you know your eyes, your brain, and your joints really love them too? introducing megared advanced 4in1... just o

dr. beverly wright, the environmental l justice plane nr , was honored and so was the great singer anthonyh. this town is starting to buzz. --urday is going to be saturday is going to be ininten. in p part becausese they're forecaststing the hottest april9 on record for washington, d.c. it will bebe beautiful w weathe, butt, please, bring g a water bottle and some sunscreen and wear a hat. it gets a something clever, but make sure it is on top of your head. is going g to be a remarkable day as people march and is peopopleurround the white hohoue and ththen sit down fofor a whi. i guess people are saying it is gogoing to be one of the biggest sit-downs if not one of t the biggest sitit-ins. wewe are well aware ofof what tp has done in his firs100 days. people a are organized all over the place to fight back. massingk about who is -- organizing g this massive assembly and why you're doing it now. >> not me, and the first place. there are hundreds of groups involved in this organizing. they have run the spectrum. in the lead, as usual, the environmental justice group's, indigenous groups, the

dr jeremy wright —— madigan, thank you very much.ure children's health, could lead to a fall in their take—up. vaccines save millions of lives around the world every year — and vaccination rates in the us remain high overall. 0ur global health correspondent tulip mazumdar reports from vashon island in washington state — which has some of the lowest vaccination rates in the country. your attention please... welcome to vashon island, a few miles off the seattle coast. it's a small, affluent community that embraces natural, clean living. these children's parents want the absolute best for them. like any medication, vaccines can cause mild and in very rare cases serious side—effects. but the scientific consensus on them is clear — they are safe, effective and save lives. these mums however are still unconvinced. we live in a society that values profit over public health. and so we really have to do our own research to find out how safe they are. there was a huge amount of evidence that it was harmful, even if they weren't ways we could s

. >> passengers say the man who was violently pulled off the uniter wrighted plane was a dr.g to get to a hospital to help his patient. no only was he bloodied but was knock out. when the employees took his seat and the three others passengers booed them. ceo of united has released a statement apologizing for having to quote reaccomodate customers the word he used reaccomodate he prom miff the company would do its own detail review on what happened. >> either way a wild scene. back here at home, police are looking for a man who posed as a customer then robbed a dunkin' donuts. this is in north philadelphia early this morning. police say the guy first ordered a sandwich then gave the cashier a demand note that read, "be smart and place the money in a bag". cashier did. then was told to go to the back of the store as that guy ran off. >>> two people are behind bars after a violent home invasion in chester county. police say a prostitute and her accomplish broke into a home when she didn't get paid for her services. it happened on valley drive in east goshen township yesterday p

bill: like the obama administration and you her john kerry and susan wright say "we got it all out there," but they did not. let's go to dr. gillespie. the emotional -- you are the president, and you do nothing to assad after he does that? >> first off, it's not up to the united states to enforce the geneva conventions. >> bill: cool would that be >> bill: who would that be? >> we are coming out of 15 years in the middle east where we have accomplished very little other than destabilizing the entire region and creating a iran -- >> bill: say on this -- >> no. >> bill: whose responsibility is this? >> the united states could start to build a coalition in the area. it's up to them to deal -- >> bill: if saudi arabia launched a few tomahawk's, you would be okay with a? >> it wouldn't be the united states. as a citizen of the united states, it's not our business to police what syria is doing in its civil war. >> if that carries forth to other countries, you have a water barbarity so nobody is going to support the geneva convention -- >> that is a leap of -- you know, a leap of judgment that is not borne out by the facts. >> b