(pronounced EE-oh-MY-ah) Eomaia meaning dawn mother) is the earliest-known primitive placental mammal (or an ancestor of placental mammals). This tiny, shrew-like mammal lived 125 million years ago, during the early Cretaceous period . Its total length was 6 inches ( a 3-inch tail plus a 3-inch body). Eomania walked on four legs and had clawed feet...