The longest annual migration of any animal on Earth, in which the Arctic tern travels an average of roughly 70,000 kilometers a year between Arctic breeding grounds and Antarctic waters, chasing near-continuous daylight across both hemispheres' summers. Over a lifespan that can exceed thirty years, a single Arctic tern may fly a cumulative distance equivalent to three round trips to the Moon, a figure confirmed only recently through satellite and geolocator tracking of individual birds.
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