Fossils of Ambulocetus, found in ancient estuary sediments, suggest it lived both on land and in water, bridging the gap between terrestrial ancestors and modern whales. The Cambrian Explosion ...

thanks to a profusion of intermediate fossils that have been uncovered over the past two decades. Another, slightly more recent form, called Ambulocetus, was an amphibious animal. Its forelimbs ...

The specimen, likely to be of the ancestors of modern whales, would have helped geologists assess the paleontological ...