A Telegraph Book of the Year. What does a mammoth smell like Do dinosaurs bob their heads as they walk like todays birds Do aurochs moo like cows You may soon find out. From the Siberian permafrost to balmy California scientists across the globe are working to resurrect all kinds of extinct animals from ones that just left us to those that have been gone for many thousands of years. Their tools in this hunt are both fossils and cuttingedge genetic technologies. Some of these scientists are driv