The arctic tern flies from the frozen arctic at the top of the world to the frozen seas around Antarctica, then returns, every year. It takes a winding course, and so travels more than 40,000 miles each year. The average bird will travel nearly 3 million miles over the course of it's life. That's the equivalent of flying to the moon and back five times.
Arctic tern (Sterna paradisaea) -- This bird has a circumpolar breeding distribution covering the Arctic and sub-Arctic regions of Europe, Asia, and North America (as far south as Brittany and Massachusetts). The Arctic tern is famous for its migration; it flies from its Arctic breeding grounds to the Antarctic and back again each year, the shortest distance between these areas being 19,000 km (12,000 mi).
arctic tern. Terns are birds that are normally found near the sea, rivers or wetlands & typically breed in noisy colonies and lay their eggs on bare ground with little or no nest material. However, the marsh terns construct floating nests from the vegetation in their wetland habitats, and a few species build simple nests in trees, on cliffs or in crevices. The sexes are identical in appearance, but young birds are readily distinguishable from adults.