Orcas Of California Coast Deciphering The Culture Of Killer Whales

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Bay Nature – January-March 2014 – Orcas of the California Coast; p.24-31.


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Name ____________________ Phys. Sci 20 – Intro Marine Environment Rise of the Tyrannosaurs – Scientific American, May 2015, p. 34-41. When most people think of Tyranosaurs, they usually think only of Tyranosaurus rex, the gigantic apex predator which lived from approximately 73 to 66 million years ago during the late Cretaceous age, the final few million years of the age of dinosaurs. The article, however, describes the long evolutionary history of the Tyranosaurs, going back at least 170 million years to the mid-Jurassic age. The great, powerful Tyranosaur lineage started out their evolutionary journey as small, bipedal, human-sized predators, and for the most part were characterized by relatively small dinosaurs. Recently discovered, beautifully fossilized Tyranosaur specimens from China show that many of these dinosaurs were covered with course feathers. The feathers, which may have been used for insulation, display, or both, further highlight the evolutionary relationship of small predatory dinosaurs and birds. Also, an insulating purpose of the feathers imply that the animals were at least partially warm blooded. While no direct evidence is as yet available, it is likely that even the 10 to 12-ton Tyranosaurus rex, and related large species, were partially covered in down or feathers during some stage of their lives. All Tyranosaurs became extinct at the end of the Cretaceous age, 66 million years ago. ...
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