Hell’s Shells: 90 Million-Year-Old Giant Turtle Egg Unveils Ancient Secrets A giant fossilized turtle egg — believed to have been laid by a turtle the length of a fully grown human 90 million years ago — has been found with the embryo inside. The tennis ball-sized egg, which is protected by an unusually thick outer … Continue reading Hell’s Shells: 90 Million-Year-Old Giant Turtle Egg Unveils Ancient Secrets