


Organisms sometimes adapt because of predators in their ecosystem. Need a translation? Check out our Wordwise glossary.

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Sea Monsters Plunge into the ocean depths, and you'll find all kinds of strange animals. These incredible creatures have amazing ways of surviving, from glowing eyes to sticky skin.

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CULTURE CLASH Spanish explorer Hernán Cortés was looking for gold. He found it in Mexico. But he also found a powerful empire in his way. The mighty Aztec ruled central Mexico with an iron hand. The Spanish and the Aztec clashed fiercely in 1519, changing the Americas forever.
Read the whole story on page 4 of our September 2003 issue.
Explore More
- Elizabeth Baquedano, Aztec, Inca & Maya (DK Publishing, 2000)
- Sally Schofer Matthews, The Sad Night: The Story of an Aztec Victory and a Spanish Loss (Clarion Books, 1994)
- Ann Rossi, Two Cultures Meet (National Geographic, 2002)
- Kevin Supples, Mexico (National Geographic, 2001)
>> Modern History Sourcebook
Read part of a letter from Cortés to the King of Spain.
>> PBS: Conquistadors
Get the scoop on Cortés and other Spanish conquistadors.
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A SCIENTIST STALKS T. REX Tyrannosaurus rex has a nasty reputation. But now scientists are rethinking their view of the infamous dinosaur. They suspect T. rex wasn't a hunter after all. Its arms were too short, and its legs were too weak. So how did T. rex survive? Find out on page 22 of our September issue.
Explore More
- Paul Barrett, Dinosaurs (National Geographic, 2001)
- John R. Horner and Don Lessom, The Complete T. Rex (Simon & Schuster, 1993)
- Pat Relf, A Dinosaur Named Sue (Scholastic, 2000)
- William Lindsay, Tyrannosaurus (DK Publishing, 1993)
>> National Geographic: Dinorama
View a CT scan of a T. rex skull, see a computer model of Apatosaurus movements, and more.
>> National Geographic News: Dinosaurs
Stay abreast of recent discoveries in the ever changing world of paleontology.
>> National Geographic Kids: Dino Brainteaser
Brainiosaurus or Juraverage Joewhich are you? Here's the place to find out.
>> Field Museum: Sue
Meet Sue! This skeleton was truly a huge dino discovery. The museum calls it "the largest, most complete, and best preserved Tyrannosaurus rex."
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