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To track the birds, the tags were attached using a harness, like a tiny backpack. Each tag measures the length of day against an internal clock. Since the length of day at Point Reyes on a given date is known, one only needs to know how many hours of light there are and what time the sun came up to know where the bird was.
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The reason for using the light detectors as opposed to GPS sensors was the weight. GPS locators were too big and heavy, even though they would offer better data. Nathaniel Seavy, research director, told Discovery News that the sensors they used were designed to be light and inconspicuous enough that it wouldn't affect the birds' flight.
Image: D. Humple / PRBO Conservation Science
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