National Geographic : 2010 Aug
Egypt isn't the only country with traces of early whales. Found in Pakistan, this 47-million-year-old Maiacetus now stands in the basement of the University of Michigan Museum of Paleontology. With robust legs and webbed feet, it propelled itself on land like a sea lion. The limbs also provided thrust for swimming; its tail served mainly as a rudder. Later whales swam more efficiently with tail power; their hind legs dwindled, and their front legs morphed into flippers.