For scientists, tracking birds has traditionally been a difficult task. Now researchers think they have solved the problem with a teeny-tiny bird backpack that contains sophisticated sensors and weighs less than a dime.

"The new technology has opened up vast new possibilities for bird researchers. Already, it is yielding surprising findings — for example, that some birds fly even faster than previously thought. But its real importance, biologists say, is the opportunity to unlock mysteries of bird migration that could help preserve species threatened by habitat loss and climate change."

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