Science, Tech, Math › Animals & Nature Dorudon Share Flipboard Email Print Dorudon (Wikimedia Commons). Animals & Nature Dinosaurs Prehistoric Mammals Basics Paleontologists Carnivores Dinosaurs & Birds Herbivores Marine Reptiles Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated March 06, 2017 Name: Dorudon (Greek for "spear-toothed"); pronounced DOOR-ooh-don Habitat: Seashores of North America, northern Africa and the Pacific Ocean Historical Epoch: Late Eocene (41-33 million years ago) Size and Weight: About 16 feet long and half a ton Diet: Fish and mollusks Distinguishing Characteristics: Small size; distinctive teeth; nostrils on top of head; lack of echolocation abilities About Dorudon For years, experts believed that the scattered fossils of the prehistoric whale Dorudon actually belonged to juvenile specimens of Basilosaurus, one of the largest cetaceans that ever lived. Then, the unexpected discovery of unmistakably juvenile Dorudon fossils demonstrated that this short, stubby whale merited its own genus--and may actually have been preyed on by the occasional hungry Basilosaurus, as evidenced by bite marks on some preserved skulls. (This scenario was dramatized in the BBC nature documentary Walking with Beasts, which portrayed Dorudon juveniles being gobbled up by their larger cousins). One thing that Dorudon shares in common with Basilosaurus is that both of these Eocene whales lacked the ability to echolocate, since neither of them possessed a characteristic "melon organ" (a mass of soft tissues that acts as a kind of lens for sound) in their foreheads. This adaptation appeared later in cetacean evolution, spurring the appearance of larger and more diverse whales that subsisted on a wider variety of prey (Dorudon, for instance, had to content itself with presumably slow-moving fish and mollusks).