Africa: Embryo Fossil Found in South Africa Is World's Oldest Proof That Mammal Ancestors Laid Eggs

[The Conversation Africa] Between 280 and 200 million years ago, a group of animals evolved which would eventually give rise to mammals, including humans: the therapsids. They were first described more than 150 years ago, based on fossils from South Africa. Since then, many more fossils have been discovered.