Consisting of deep ocean covered by drifting pack ice and surrounded by continents and archipelagos around the Earth's North Pole, the Arctic is the planet's largest and least fragmented inhabited region.
Why the Arctic matters
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Tundra to tropics: Flyway cooperation for Arctic-breeding species
Many different bird species migrate to the Arctic to breed—and some are struggling to cope with the effects of climate change and other environmental hazards.
Published 11 October 2019