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[27] [58] Contrary to modern sperm whales, most ancient sperm whales were built to hunt whales. Livyatan had a short and wide rostrum measuring 10 feet (3.0 m) across, which gave the whale the ability to inflict major damage on large struggling prey, such as other early whales.
The Marine Mammals of the North-western Coast of North America: Together with an Account of the American Whale-fishery. Dover. ISBN 978-0-486-21976-9. Schmitt, Frederick; Cornelis de Jong; Frank H. Winter (1980). Thomas Welcome Roys: America's Pioneer of Modern Whaling. University Press of Virginia. ISBN 978-0-917376-33-7. Webb, Robert (1988).
A beaked whale is any of at least 22 species of whale in the family Ziphiidae. Several species have only been described in the last two decades. Six genera have been identified. They possess a unique feeding mechanism among cetaceans known as suction feeding. They are characterized by having a lower jaw that extends at least to the tip of the ...
Archaeoceti ("ancient whales"), or Zeuglodontes in older literature, is a paraphyletic group of primitive cetaceans that lived from the Early Eocene to the late Oligocene 1] Representing the earliest cetacean radiation , they include the initial amphibious stages in cetacean evolution , thus are the ancestors of both modern cetacean suborders ...
Whales evolved in South Asia, and it was previously thought that the fluke helped early whales spread across Earth from there, so Georgiacetus' presence in America and its legs and tail contradicts this hypothesis. [8] Uhen 2008 also established the clade Pelagiceti [9] to show the relationship between Georgiacetus, the basilosaurids and modern ...
Whales evolved from land-living mammals, and must regularly surface to breathe air, although they can remain underwater for long periods of time. Some species, such as the sperm whale, can stay underwater for up to 90 minutes. [2] They have blowholes (modified nostrils) located on top of their heads, through which air is taken in and expelled.
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Dinosaurs evolved and began their rise to dominance, quickly spreading into the United States. Soon, Pangaea began to split up and North America began drifting north and westward. During the latter Jurassic, the floodplains of the western states were home to dinosaurs like Allosaurus, Apatosaurus, and Stegosaurus.