👉 Ambrymidae is a family of extinct group of mammals that lived during the Late Cretaceous period, around 68-57 million years ago. These animals are characterized by having a robust, muscular body with large eyes and long limbs. They were known for their strikingly curved tails, which they used to walk on land or swim in water. Some species of Ambrymidae have been found buried under sedimentary rocks in the Arctic region, suggesting that they may