my son airing remembered seeing on "world news with diane sawyer" a new technique for cpr. we were so lucky to have watched diane and dr. besser that night. i know it does seem crazy, but watching "world news with diane sawyer" saved my husband's life. this is my family and that is our abc "world news" story ♪ i get by with a little help from my friends ♪ ♪ get high with a little help from my friends ♪ >> all right. so there is this lion, tiger and bear all living together. no, not a joke. this is true. >> you want to say, oh, my. >> oh my. >> nature's biggest killers are living together and getting along. everyone plays nicely together. that's why we have made this our "favorite story of the day." abc's steve osunsami shows us the frenemies. >> reporter: three of the planet's top predators, king of the jungle with teeth for miles, the most aggressive feline in the world, and 700 pounds of north american killing machine who could break an animal in two with a single swipe. and somehow they get along.