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They can grow more than two metres long and weigh as much as three men. But the giant tortoises of ice age North America were even larger. Florida does have tortoises today, but on a much smaller scale. This is the gopher tortoise. Tortoises are cold

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It's likely giant ground sloths used their claws in a similiar way to hook branches and pull them within reach. Like tree sloths, they were vegetarians and probably not fussy about what they ate, chewing their way through leaves, fruits, twigs and al

英语听力：探索发现 2013-01-02 冰河新新州 Ice Age Oasis—9

The cold climate conifer forests of the north displaced broadleaved woodlands. Plants and animals were gradually pushed south to find a warmer climate. Florida became a refuge from the cold. Down here is where the Ice Age north met the subtropical so

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