Perissodactyla, Artiodactyla and Primates ... origin of these orders is one of the great conundrums of mammalian evolution. Perissodactyls, including extant horses, rhinoceroses and tapirs ...

Though paleontologists had found remains of Perissodactyla from as far back as the beginnings of the Eocene epoch (about 56 million years ago), their earlier evolution remained a mystery, says Ken ...

Though paleontologists had found remains of Perissodactyla from as far back as the beginnings of the Eocene epoch, about 56 million years ago, their earlier evolution remained a mystery ...

What exactly this creature was puzzled scientists, including the father of evolution ... they're part of a group called Perissodactyla. The animal's lineage and that of modern perissodactyls ...