AFC East

Why Did Mammals Move to the Sea and Become Whales and Dolphins? Study Examines How

Cetaceans, a group of animals that includes whales, porpoises, dolphins and other aquatic mammals, originated on land and subsequently moved into the sea. But how? And why? Knewz.com has learned that the first cetaceans to be completely aquatic emerged around 41 million years ago. One of the earliest known cetaceans was a species known as the Pakicetus, a wolf-sized, four-legged land mammal known from fossils dating back to the Early Eocene Epoch (55.8 million to 49 million years ago) in Pakistan. Pakicetus mostly lived near riverbanks and lakes, and according to the scientific news outlet IFL…