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Past 20 years have seen renaissance in different technologies to track bird migrations around the world

WASHINGTON -- A bay-breasted warbler weighs about the same as four pennies, but twice a year makes an extraordinary journey. The tiny songbird flies nearly 4,000 miles between Canada's spruce forests and its wintering grounds in northern South America.

WASHINGTON (AP) — A bay-breasted warbler weighs about the same as four pennies, but twice a year makes an extraordinary journey. The tiny songbird flies nearly 4,000 miles between Canada’s

The Bird Migration Explorer mapping tool, a new online atlas of bird migration, tracks around 450 bird species in the Americas. The past 20 years have seen a renaissance in tracking technologies by using data from birdwatchers and scientific communities.

WASHINGTON (AP) — A bay-breasted warbler weighs about the same as four pennies, but twice a year makes an extraordinary journey. The tiny songbird flies nearly 4,000 miles (6,437 kilometers) between Canada's spruce forests and its wintering grounds in northern South America.