nowhere is this more clear than at nairobi national park. t 44 square miles, it's twice the size of manhattan. yet its parameters are constantly being whittled down. >> that's downtown nairobi. >> reporter: we head into the park with arthur of the giraffe conservation foundation. the rwandan-born researcher is getting his ph.d. at michigan state. >> traffic jam. >> reporter: amidst the monkeys, zebras, hippos and giraffes dotting the landscape, another ubiquitous sight. this image sums it up, that man is encroaching on his habitat? >> yes. if you look up ahead you can see the real problem. those are housing developments coming up. and a few years back, you never used to have that. all this used to be open. >> reporter: a giraffe's kick can break a lion's back. but giraffes are being killed off by a far more lethal predator, from trophy hunters to poachers. >> they're hunted for their meat, skull, and bones. in some places it's traditional medicine, bones and brain, that giraffes can cure aids. in some places they're hunted for their tails onl

closely the urban sprawl is approaching on the habitat, this is the national park, and this is the highway. nowhere is it more clear than nairobiional park. just miles away from giraffe manor, at 44 square miles, it's twice the size of manhattan, yet its parameters are whittled down. >> that is downtown nairobi. >> reporter: we head into the park with the giraffe conservation foundation. he is getting his ph.d. at michigan state. traffic jam. amidst the monkeys, zebras and giraffes dotting the landscape, another ubiquitous sight. this sums it up, that man is encoaching on his habitat. >> yes. if you look straight up ahead, you can see the real problem. so those are housing developments coming up. >> yeah. >> and a few years back, we never had that. and all this used to be open, animals could migrate going that way but now most of those areas are just inaccessible. >> reporter: detour. that giraffe is completely holding its ground. it's like, huh-uh, i ain't moving. you're in my 'hood. a giraffe's kick could break a lion's back. but they are killed off from trophy hunters to poachers. >> they are hunted for their meat, skull and

this is the national park and this is the highway. nowhere is it more clear than nairobi national park. at 44 square miles, it's twice the size of manhattan but its parameters are whittled down. >> that is downtown nairobi. >> reporter: we head to the park with the giraffe conservation foundation. he is gets his phd at michigan state. amidst the monkeys and zebras and giraffes dotting the landscape, another sight. >> you look up ahead and you can see the real problem. they are housing developments coming up. >> yeah. >> and a few years back, we never had that. and all this used to be open and now, they are just there. >> reporter: detour. >> that giraffe is holding its ground. it's like, no, i ain't moving. you're in my hood. >> a giraffe kick with break lion's back. but they are killed off from trophy hunters to approachers. >> they are hunted for their meat, and bones. se some places, it's tradition toal believe that bones and marrow can cure aids. >> reporter: so they will kill an animal -- >> for the small tail. >> reporter: man is the biggest threat to giraffes. >> y

but the mix of biggest national park is a treasure trove for insect research as we find out why that believe. it will be talking to some of just sunday cassim nairobi to hear about the common state off the insect world in africa we'll also be talking about for the way a young french woman has come up with a simple solution that will talk with the problem of. insects they are everywhere they are an outstanding nine hundred thousand different kinds of living insects known to scientists that accounts of about eighty percent of the world's species and new ones are being discovered every day that discover those discoveries are. thanks to their dedication searchers like the team guards are more than big. national park. just no prey is too small here in the national park in mozambique ricardo gutierrez out hunting. but he's not looking for lions or elephants he's looking to bag insects. with this . dormant this insect belongs to the beetle family. the ground beetle family. if you touch it and it's a cretin as cynical liquid although you. ricardo works with entomologist. in the e.r. wilson biodiversity laboratory. one objective of this research facility is