Explore The Age of Mammals, spanning 66 million years and shaping the world as we know it today. The Cenozoic collection highlights renowned species such as the towering Woolly Mammoth, the formidable Smilodon as well as lesser known early ancestors including the bizarre Nothrotheriops and the ruthless Phorusrhacos. Track the rise of the mammals, the fallout of ice ages and the evolution of grasslands and forests as you assemble your own Cenozoic ecosystem!