00513nam a2200085Ia 4500008004100000245003800041300027700079650001300356856005800369170517s9999    xx            000 0 und d  aWhat Really Killed the Dinosaurs?  aFor more than 150 million years, dinosaurs dominated Earth. They were so successful that other animal groups - mammals included - had little chance of playing anything more than secondary roles. Then, 65 million years ago, the dinosaurs vanished from the world forever....  xScience.  uhttp://topdocumentaryfilms.com/what-killed-dinosaurs/