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For example, long-distance migrating birds commonly eat more prior to their big flights. These birds become quite fat, which provides the energy they need to make the journey. The European garden warbler will risk crossing the Sahara Desert to its winter habitat in tropical Africa once it has enough fat stores. But the record breaker for distance is the bar-tailed godwit, a seashore bird that uses its long beak to probe sand or mud for insects and crustaceans and builds up fat stores in both its body and liver in late fall before migration. One godwit was documented to have flown seven thousand miles in an eight-day nonstop flight from Alaska to New Zealand.
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Richard J. Johnson (Nature Wants Us to Be Fat: The Surprising Science Behind Why We Gain Weight and How We Can Prevent-and Reverse-It)