first up, as 50 years of fighting endnd in colombiaia, fc rerebels are tryrying to resumua normal lifife, but whilele theyy be laying down their arm m manya are not giviving up the fifight. ththen a tribe i in panama witih rong rts in thrain fort seeks a land title to secure their territory, and they're protecting their borders with a surprising form of surveillance... [beeping] [motor r revs] drones.

i've learned my lesson and i willll change my lifife.ihispell l in rehab m might e been rough, but it probably saved his life. out on the streets, the killing continues, overseen by the president himself. host: what can be done to help drug addicts? series. this is when we meet peoeople dedidicated to conserving our natural world. this week we're in the serengeti national park in northeast tanzania. a populalation explosision hase hand in hahand with growing demd for grazing land for livestock. the trouble is, wildlife n nees it, too. our reporter inga sieg and cameraman axel warnstedt went to tthe serengeti to see how thees park and the region around it are faring. reporterer: these lions don't ed to wororry where theirir next l wiwill come fromom. millions of wildebeeeest, zebrs and antelope traverse the serengeti national park every year in the largest mammal migration in the world. but the parkrk is in danger. conservationists rian and lorna labuschagne have been working in national parksks for over 30 years. n now they're here in te

first up, as 50 years of fighting endnd in colombiaia, fc rerebels are tryrying to resumua normal lififewhilele theyy be laying down their arm m manya are not giviving up the fifight. ththen a tribe i in panama witih rong rts in thrain fort seeks a land title to secure their territory, and they're protecting their borders with a surprising form of surveillance... [beeping] [motor r revs] drones.