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hunting. ♪ >> it was this combination of feeling awe and at the same time a little bit of horror and shame. it goes into your heart and into your mind, and it doesn't leave you. >> at the ends of the earth is a land of extremes. home to spectacular wildlife. for centuries, people and enemies have battled for supremacy, but now enemies are becoming allies. together they face new challenges in our rapidly changing world. >> you are at the mercy of the elements. >> this is the story of what it takes to survive on the edge of the world. >> the land along patagonia's eastern coast is ba...

They were driven to the brink of extinction. by the end of the 1960s, less than 1,000 were left worldwide. researchers mariana has been monitoring their population for decades. opinion >> look at the impression, and i said come on. p >>p. >> mayor i don't know whata is now dedicated to protecting these whales. >> taking skin samples it is a key way to monitor them.