bonded not by blood but bloodshed. authorities say the bike gangs and street gangs have the same kind of criminal pursuits. we hear more about street gangs because the bike gang population is relatively small, 2.5% of the total gang population worldwide, but they become a problem, according to law enforcement, in areas where there are disputs over territory, turf wars. incredible. incredible how much we re learning. 2.5% of gangs around the country. thank you very much. next outfront was there when an american hunter tracked and shot an endangered black rhino. it s an incredibly controversial hunt. we told you about the story and went with him to africa. you ll see that exclusive next. we ll say good-bye to david letterman who proved even turkeys can fly. a turkey is a flightless bird. i don t think so.