Blago, Tiger, U.S. Contractors and Madoff Named Worst-Behaved
Nightline Announces Winners of Not-so-Coveted "Bernie" Awards for 2009
Ex-Scientologists Level Accusations
Former members say leader David Miscavige struck subordinates; Church denies.
Sexy Beasts: Apes Make Love, Not War
The Congo is home to population of bonobos, who resolve conflict through sex.
The World's Most Aggressive Vegetarians?
Uganda's hippos are large and in charge, but friends in Congo are endangered.
Rare Tree Kangaroo Caught on Film
"Nightline" travels to Papua New Guinea to see endangered species roam treetops.
Bushmeat Sold on Open Market in U.S.
Conservationists call to stop illegal trade of bushmeat and protect animals.
The Truth Behind Great White 'Bite' Pic
"Nightline" goes to Australia, where shark found with huge bite taken out of it.
Living With Gorillas: 'He Could Kill You'
Angelique Todd has devoted her adult life to habituating rare lowland gorillas.
Clinton: 'Not Every Taliban Is al Qaeda'
Hillary Clinton talks Afghan strategy, her role as secretary of state.