Xenocranium lived during the Eocene epoch, 55 million to 34 million years ago. It had a skull tipped with a broad scoop, which it likely used for digging. In fact, its entire skeleton, with its short, strong limbs, was specialized for burrowing.
The gigantic extinct sperm whale Livyatan melvillei measured a whopping 60 feet (18 meters) in length. It had huge curved teeth lining its upper and lower jaws — unlike modern sperm whales, which grow conical teeth only on their lower jaws.