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Turtles: World
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Turtles are an ancient group represented in the fossil record as far back as 200 million years ago. Their conservative body plan and successful strategy for survival endured the test of time as their lineage plodded along past such environmental cataclysms as the Cretaceous extinctions of the dinosaurs and various "ice ages." However, resilient as they are, turtles have fared poorly in the modern, human-dominated world.
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Feb. 7 /PRNewswire/ -- An array of cute monkeys, tigers, turtles and crocodiles (who were somehow granted licenses to drive) populate Nintendo's newest Wi-Fi-enabled game for Nintendo DS Lite, Diddy Kong Racing DS. The racing adventure further revs the engines of Nintendo Wi-Fi Connection, which already has connected more than 3.5 million unique users worldwide for more than 100 million online game-play connections. Diddy Kong Racing DS adds another classic to this portable wireless community, complete with new tracks, upgradeable vehicles and a course-design mode.
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The majority of the world's turtles have environmental sex determination (ESD) and this was not discovered until the early 1970's. In contrast, most familiar animals have genetic sex determination in which the sex of the offspring is determined by the genetic contribution of the father. Offspring receiving an X chromosome from the father develop into female embryos, and offspring receiving a Y chromosome from the father develop into male embryos. Because the probability of receiving either chromosome is equal at conception, sex ratios of human babies tend to be 1:1.
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Snapping turtles are the biggest turtles in the world. The Common Snapping Turtle, though, is smaller than its cousin, the Alligator Snapping Turtle. You may want to take a side trip to Raccoon Hollow to play the Snapping Turtle Games housed there.
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Millions of school children have created graphics and animations by giving Logo commands to turtles on the computer screen. This active essay uses a version of Logo called MicroWorlds which has a plug-in for use on the World Wide Web.
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There are only a few large nesting populations of the green, hawksbill and loggerhead turtles left in the world. Australia has some of the largest marine turtle nesting areas in the Indo-Pacific region and has the only nesting populations of the flatback turtle.
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