>>> over to this next incident with the sisters adelie and annie. we've had them on the show many times before. >> what is that? >> lotion. >> who gave you lotion? >> um, amy. >> you gave her the lotion? >> yeah. >> and you told her to put it all over her face and all over my chairs and -- all on the window? >> this is very telling of their relationship. the sisters -- >> she is just joking, she's trying to not get a whupping so i'll get a whupping. she's lying. >> that's the opposite of what is happening. you're the evil twin and it's this one. >> daddy's coming. now you'll get a whupping. and momma clean it all off. and you'll still get a whupping. >> we would love to teach her the code. >> because clearly she's in violation. >> she's lying. >> she's lying? >>> coy fish get into formation. >> i kind of expect to see somebody with a remote control. it feels like somebody is -- >> see the unbelievable footage. >> plus it's her 13th birthday and mom has a huge surprise. >> she's speechless. >> hear the story behind this touching moment. >> oh wow. bu

. >> heather lynch says the adelie penguin population here has declined by seventy percent since thes. and the chinstrap population is down fifty percent in some places. incredibly at the same time the gentoo penguin population is actually growing. >> some of these birds, some of these penguins have thrived the last couple of years. >> oh they have, these guys right behind us the gentoo penguin, their population grow three, four, five percent a year. the secret, adaptability. the gentoos are adjusting their diets and moving their nests to more suitable places. >> they roll with the punches. in a way that these other species just can't. and in that there is a big lesson for us, you know, that we have to adapt or we're not going to make it. >> at stony brook dr. lynch analyzes drone footage and even satellite shots. >> so the technology that we're using now isn't just telling us how many penguins there are, it's telling us all sorts of things about penguin behavior. >> it's the way to get the big picture. >> so what are the penguins telling us? >> i think they're telling us that things