Paleontologists have uncovered a wealth of whale fossils spanning the Eocene epoch, the time between 55 million and 34 million years ago when archaic whales, or archaeocetes, made their transition from land to sea.
Paleontologists have uncovered a wealth of whale fossils spanning the Eocene epoch, the time between 55 million and 34 million years ago when archaic whales, or archaeocetes, made their transition from land to sea.
古生物学家已经找到了丰富的始新世古鲸化石，也就是现生鲸豚的祖先；他们发现古鲸是在5500~3400万年前的始新世，从陆栖动物演变成海栖动物的。