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"You can't put a nine-volt battery on a bird," since the battery would weigh more than a lot of birds, Shafer said. The solution, he said in a telephone interview, is to make the bird supply its own electricity.To see if that's possible, Shafer recruited a pigeon to see if he could build a backpack loaded with instruments that wouldn't cause the bird to flip over on its back and crash to the ground. He knew the package could weigh no more than 4 percent of the weight of the bird.
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