Scientist studies how ancestors of today's mammals responded to climate change
Monday, August 25, 2014 - 05:40
in Earth & Climate
About 10 million years into the current Cenozoic Era, or roughly 56 million years ago, during a climate that was hot and wet, two groups of mammals moved from land to water. These were the cetaceans, which include whales, dolphins and porpoises, and the sirenians, with its sea cows, manatees and dugongs.