Fossil evidence has established that modern dolphins and whales derived from small, four-limbed, hoofed animals that lived in South Asia during the Eocene around 50 million years ago. The ...

Certain skeletal features of archaic whales, particularly their large, triangular cheek teeth, strongly resembled those of mesonychids, a group of hoofed Eocene carnivores. (The massive ...

Therefore the aquatic cetaceans (toothed and baleen whales) that began to appear 50 million years ago in the Eocene must have evolved from terrestrial animals. What remains unclear is which group of ...

The first was right at the beginning of whale evolution, just shy of 50 million years ago, when the archaeocetes—the ancestors of modern cetaceans, which emerged in the Eocene Epoch—were first ...

Get Instant Summarized Text (Gist) Fossils from the Eocene mudflats of Utah reveal four new ichnospecies, indicating diverse foraging behaviors of ancient waterbirds. These trace fossils ...

It's the tale of an ancient land mammal making its way back to the sea, becoming the forerunner of today's whales. In doing so, it lost its legs, and all of its vital systems became adapted to a ...