More than two-thirds of mammals in Africa and the Arabian Peninsula went extinct during the Eocene-Oligocene transition some 30 million years ago, a study finds. Chloe Tenn is a graduate of North ...

During the Oligocene epoch about 33.9 to 23 million ... Today, we live alongside large animals like elephants, crocodiles and ostriches. Why do you think they survived while others perished?