this is "nightline." >> tonight, eggs exposed. they say life is fine on the farm. but a video filmed in secret seems to show a much uglier scene. could conditions like these lead to safety risks for consumers? >> as the manager of this facility, what did you think watching those videos? >> i was disturbed. >> tonight, america's breakfast questioned in an investigation at one of the country's largest egg producers. nobody ever said being a kid was easy. >> school was great, all right? >> pixar's latest adventure goes deep inside an 11-year-old girl's brain in "inside out." tonight the star-studded cast tells us how her emotions can teach us all. >> to be in a young girl's head is kind of like a professional and personal dream. and separated after birth.

a joyful moment for a family that's been through the unthinkable. their twin girls born close. too close. now one step closer to living a normal life. but first the "nightline 5." >> number one in just 60 seconds.

good evening. thanks for joining us. tonight, breakfast confidential. an investigation into what life is like for chickens at one of the biggest egg producers in the country raising new questions about the most important meal of dat day. abc's david wright puts one company in the hot seat for our series "night line investigates." >> reporter: this is the image hill and dale farms presents to the world. a promotional video showcasing the pristine conditions at its massive chicken coops in rural pennsylvania where they ship eggs around the country to retail giants like costco. >> our hens are healthy and the eggs at the peak of their quality. >> reporter: this is hidden camera footage conducted by an undercover investigator from the humane society of the u.s. their investigator worked as a day laborer at hill and dale for three weeks this spring. >> you wouldn't see this kind of dust and dirt if they were cleaning it every day.

>> reporter: wayne passelli is a humane society spokesman. >> here they're bunched up and they're falling because this bird got stuck in the cage wire. >> the birds are mummified. the birds have to have been in there awhile. warning bells go off for me, they should be going off for the fda. >> we've been reporting on the massive recall -- >> reporter: in 2010 a salmonella outbreak sickened more than 1,900 people. federal food safety officials traced it to several big egg farms. congress held hearings on the outbreak. >> here's my question, and again, you're under oath sir. >> reporter: hill and dale's then-president refused to answer questions. >> i respectfully decline to answer the question based on the protection afforded me under the fifth amendment. >> the image of the ceo of a company getting up in front of congress and taking the fifth doesn't exactly inspire confidence. >> we weren't running the operation at that time. >> this is a new regime? >> that's there now, absolutely. >> reporter: jeff martin is a hill and dale manager.

the company was considerably more forthcoming with us. after the humane society shared its footage with "nightline" we brought it straight to hill and dale who agreed a week later to give us a tour. >> is this the same building that we see in that video? >> yes. >> you've had a chance to clean it up a little bit. >> a little bit, a little bit. >> taking us inside some of their giant hen houses near gettysburg. >> as the manager of this facility, what did you think, watching those videos? >> i was disturbed. i was disturbed because it doesn't represent what we are. i don't see what was in that video. there were parts of the video that saddened me. there were parts that made me angry. so we launched a full-scale investigation as to what happened. >> reporter: the hen house seemedo be cleaned up significantly. the feathers cleared off, for the most part. the dust swept. no rodents on the floor. no piles of broken eggs. no swarms of flies. and the chickens, 120,000 of

them in this one barn clucking away. >> is there anything that you saw in that video that if allowed to persist could lead to another outbreak of salmonella? >> can i have a minute? >> just give him a second. is there anything you saw in that video that if it were persistent could lead to another outbreak of salmonella? >> yes. >> what would that be? >> any of the -- a lot of the things. >> reporter: dr. gregory martin a poultry educator brought here by hill and dale disagrees. >> as bad as it looked it wasn't as bad as -- it wasn't a threat to the safety of those eggs. >> reporter: they face quarterly inspections from state agriculture officials and hill and dale has passed those inspections, none of which is reflected on that video. >> if i only saw that video and i wasn't in the business it would concern me. but what i can assure you, the

video isn't a true representation of our program. we have the safest food safety program in the industry. >> are you worried that one of your big customers, costco could see something like this this video and think twice about buying your eggs? >> yes, i am worried about their reaction to the video. because hill and dale we are very proud of our program. >> reporter: david atchison is an independent food safety consultant. he agrees the humane society video does not give a complete picture of conditions at hill and dale's facilities but he says it's troubling. >> video is by definition a snapshot in time. >> reporter: he points to dead birds, the ones being pried off the cages. >> when you see evidence that some of those carcasses from the dead birds have been there for what could appear many days if not weeks, then that clearly raises concern. >> they can gussy things up and give a white-glove tour but in general, this sort of facility

has fundamental problems. and we think that certainly a major company like costco should not be associating with it. >> reporter: you see the humane society has another agenda. they want to pressure big retailers like costco not to buy any eggs from farms that keep hens in cables which they consider cruel. >> costco's the third-biggest food seller in the united states. it told us eight years ago that it was going to opt for cage-free production. and only use suppliers that were going to produce those cage-free eggs. >> reporter: costco wholesale says it is committed to the ethical treatment of animals and says that while hill and dale has identified some areas in which it believes it can improve, it believes that hill and dale is behaving appropriately. folks at hill and dale took us to a second hen house. the equipment looks brand-new. they say they're in the process of upgrading that first hen house to be more like this one.

a chicken coop as long as a football field. 250,000 hens in this one building alone. and there are five of these barns on-site. a chicken city. population, 1.5 million. >> you've got one, two, three, four, five and another five all the way up there. this is a new york city highrise. for chickens. >> reporter: row upon row of hens laying eggs. this is their life for 18 months. the amount of space each hen has smaller than a standard sheet of writing paper. >> we don't tend to think a lot about where our food comes from. yet it stands to reason that that's what it takes to produce the amount that we as a nation consume. >> years ago there was concern about cholesterol. now eggs are an energy food. so consumption per individual is up. >> reporter: the argument there being that a facility like this is not just cruel to the hens but also if it's unsanitary

dangerous for humans too. >> when a biological organism is severely stressed they're more susceptible to the onset of disease. plus when they're overcrowded, you have more pathways for transmission. >> it seems like we're talking about two different things here though. one, you're interested in animal welfare. but two, you're talking here about food safety. and it doesn't seem like there's necessarily a connection. >> when you mistreat animals and you stress them and overcrowd them, you often produce food safety issues. >> reporter: the proof, they say, is right there in that hidden camera footage. hill and dale farms disputes that. >> i see this as attack. we would welcome, if somebody wanted to come and see our farm and see how we treated the birds, we would welcome working with them. so they don't have to come in undercover and shoot a video that isn't the normal thing. >> are you saying he was too busy filming and not doing his job? >> if the goals are to produce

safe quality food in an animal-friendly environment, we're all for that. if the agenda is to get people to stop eating eggs chicken, spare ribs steak? it's a whole different animal. >> reporter: next time you cook breakfast, it is certainly food for thought. i'm david wright for "nightline" in gettysburg, pennsylvania. next "inside out." amy poehler and mindy detailing on why some of hollywood's hottest stars want to give voice to an animated moviebout one preteen's emotions. plus one family's unmitigated joy as their conjoined twins endure a harrowing journey to be separated after birth. rheumatologist about a biologic this is humira. this is humira helping to relieve my pain and protect my joints from further damage. this is humira helping me reach for more. doctors have been prescribing

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tonight, the creative masterminds at pixar taking us inside the making of "inside out." they've already managed to snag 15 oscars with hits about talking cars or a little fish named nemo. now name miscellaneously funny ladies amy poehler and mindy kaling play feelings. explaining why a simple story about an emotional 11-year-old will no doubt get the rest of us pretty emotional too. >> train of thought. right on schedule. anger. unload the daydreams. i ordered extra in case things get slow in class. >> reporter: leave to it pixar to take us somewhere we've never been before. behold, the inside of an 11-year-old girl's brain. >> what was that? i thought you said we were going to act casual. >> reporter: "inside out" stars

a preteen girl's mixed emotions. >> i'm joy. this is sadness. >> reporter: that familiar chirp belongs to amy poehler. >> joy? >> yes, joy. >> you'll be in charge of the console, keeping riley happy all day long may i add i love your dress, it's so adorable oh thank you so much i love the 8 wa it curls. >> reporter: the queen of "saturday night live" and "parks and recreation" embodies joy. >> to be in a young girl's head is kind of like a professional and personal dream. >> reporter: mindy kaling plays disgust. >> when i'm through, riley will look so good. the other kids will look at their own outfits and barf. >> because they're inventing every aspect of this the setting, what it looks like what the characters look like on the page and what i saw in the movie are completely different. >> reporter: they run the girl's brain from a control center a complex world created by director and writer pete docter. >> what was the inspiration? >> watching my daughter she

turned 11, she went from being really happy, crazy kit kid, to being quiet, shy, reclusive. i thought, that's weird, i wonder what's going on in her head. >> reporter: he conjured up that battlefield of emotions. >> you based it on scientific brain research? >> it was really fascinating. because a lot of these things you kind of think of as negative. you know, fear. i want to avoid feeling fearful and acting fearful. but at its heart, fear is there to keep you from getting hurt. to keep you alive and safe. anger is all about fairness. to make sure that you're not getting screwed or taken advantage of in some way. >> reporter: a master story teller pete was employee number ten at pixar studios, our corporate cousins. >> hold on woody! >> reporter: while there, he helped craft the bromance between a cowboy and a space man in "toy story." those monsters under your period. >> don't let it touch you! >> reporter: and that

heartbreaking, wordless four and a half minute montage of a marriage in "up." the tear-jerker scene helped earn him an oscar. >> you really do make people cry. it seems very mean of you. >> well. >> why does every movie make me cry? >> i think the reason you go to movies is to have that emotional equipment tested out and to feel like you're experiencing life at its fullest. that's what it's about. >> reporter: it's all accomplished in the subtleties. in a monster's look. a brave gesture. >> i am merida! >> reporter: a shift in expression. as the film's writer and director, pete has a special way with actors. >> pete was right across from me. so it felt like being directed on a live action feature. >> there are at least 37 things for riley to be scared of right now! >> can you adjust it to be slightly more scared yourself? >> okay. there are at least 37 things for riley to be scared of right now! >> reporter: every sequence

painstakingly created from sketches, clay models and finally, animation. >> the closer she gets the more delicate and slow she's going to move. >> reporter: the pixar campus is chock full of amenities. a fun factory conceived by steve jobs. >> this is the way to travel. >> whoa! >> we're totally spoiled. look at this. soccer field. we have the swimming pool. >> people are working so hard that half the time those facilities aren't even used. >> i have never set foot in the pool. >> reporter: the more creative types here pimp out their work spaces. >> and it opens that. >> oh just out of the movies! >> reporter: transforming them into speakeasies. >> animators come by and have a drink. >> reporter: >> reporter: the planes that crash landed in jungles. your brains are so fertile you convert these things. >> reporter: these offices, a veritable restaurant row. >> the taqueria here. sushi restaurant. >> reporter: animators are known to work grueling 80-hour weeks and it takes a full week to

create just five seconds of film. >> we spend five years making a film. three of that are just on the storytelling. and retelling it over and over until we have just the right combination. >> oh yeah. that sounds fantastic. >> reporter: the result? a convincing depiction of a petulant, prepubescent girl. >> are you targeting children or adults as you're creating the movie? >> the main person i'm trying to please as i'm writing is me. i want to entertain myself. and the other guys that i work with. >> you're not targeting a demo? >> no not -- i've always found every time i try to write for a specific demographic it ends up like i'm talking down or doing something -- i've got to be interested myself. even though the films might been monsters or cars or fish you always want them to be about us. >> show me where we're going. >> okay. only -- i'm so sad to walk, just give me a few. >> a simple message is that it's okay to be sad sometimes. the bigger message is that you

know, you never know what's going on inside someone's head. we all have these emotions that are fighting for control. and i just love what pixar does which is it takes these big, complicated ideas and it makes them into these very beautiful and specifics in universal worlds. >> when she first scored a goal it was so amazing. >> reporter: a little girl in a big world. showing the rest of us we're not alone. "inside out" will be in movie theaters june 19th. two formerly conjoined twins reunite after a successful surgery. and we are there. mething out there. it's a highly contagious disease. it can be especially serious- even fatal to infants. unfortunately, many people who spread it may not know they have it. it's called whooping cough. and the cdc recommends everyone, including those around babies, make sure their whooping cough vaccination is up to date. understand the danger your new grandchild faces. talk to your doctor or pharmacist about you and your

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the family you're about to meet has been through a months-long touch and go deal. the twin daughters were born conjoined but their parents vowed to give them their best shot at leading normal separate lives. tonight a homecoming. a family is finally reunited. >> reporter: it's a day the mata family only dreamed about. a family photo with two baby girls on their laps. two sisters, now reunited. a happy ending to a harrowing story that begins here a little over a year ago. natalie and adeline were born conjoined from the ribcage down to their pelvis. with some internal organs fused together. >> i want to give them a shot at a normal life. >> reporter: the mata family invited "nightline" to witness every step of their dramatic journey toward separation. >> separating conjoined twins is a very complicated task. >> reporter: when a team of 12 surgeons at texas children's

hospital embark on one of medicine's rarest and in this case riskiest surgeries -- >> it's just very daisy there for a while. >> reporter: a grueling 26-hour operation. one false move can spell disaster. >> i don't want to lose them. and i know there's that risk. >> reporter: during the surgery, the parents are called for an in-person update with one of the doctors. it turns out that adie's heart was weak and had to be pumped by hand. >> there's a fair amount of bleeding with dividing the liver. during that bleeding process, adaline's heart wasn't pumping very well. >> reporter: when the family is called back for another worrisome face-to-face meeting, this time it's the news they've been waiting for. >> so far, so good. the twins are separated. >> oh yay! >> everything is well. >> yay! i told you, i told you, i told you! >> reporter: little natalie, the stronger of the two, goes home first in may.

leaving her sister behind. >> in two weeks, it's your turn. >> reporter: now it's finally adaline's turn. her lungs still weak. but no doubt will grow stronger with the help of her sister. >> and we'll be following their saga. thanks for watching abc news. tune into "good morning america" tomorrow. as always we're online 24/7 on our "nightline" facebook page. and at abcnews.com. good night, america. how was your class today, dear? did the children listen to you? i teach traffic school, ma. since when? since today. lots of cops do it, you know. chance to earn a little spendin' ney. how about spending a little on rent? there may not be any money. got my first student evaluations today. yeah? what did they say, dear? you wanna know what they say? ok, ma. here's what they say-- "this class is a sure

cure for insomnia." "next time, just please take away my license." that's just a couple of people. who cares what they say? "after 10 minutes, "i wanted to take the officer's gun and end my misery." i stink! come on, robert. it was your first time teaching. yeah? the supervisor said it might be my last. he's sittin' in on my class tomorrow. oh, well, now, that's not fair. you probably just need a little practice. it's really not the type of thing you can practice. it's all about relating to people. you're a dead ma honey, lis