For many animals, the urge to move when the days change length and temperatures vary is programmed into their genes.
Feb 3rd, 2008 | 0 comments | 1,288 Views
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Earth Navigators: Globe Trotters
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Earth Navigators: A Hopping Plague
Locusts look like grasshoppers and are in fact a close relative. But unlike grasshoppers, locusts undergo a remarkable change when their populations grow.
Apr 23rd, 2000 | 0 comments | 1,278 Views
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