( See amazing pictures of animals in the coldest places on Earth.) And one incredible animal-the Arctic tern-lives at both ends of the Earth, thanks to the longest known migration on the planet. Some species, like polar bears, evolved to hunt and breed on the ever-shifting ice pack of the Arctic, while other types of closely related species, such as ringed seals and Weddell seals, have adaptations specific to life in the north or south. These unique characteristics are reflected in the wildlife living in each place. The Arctic is also characterized by an ice cover that fluctuates with the seasons.
At the top of the planet, the Arctic is made up of the Arctic Ocean and other bodies of water, all located near the highly populated continents of Europe and North America.
But they’re actually worlds apart.Īntarctica is an ice-covered continent in splendid isolation at the bottom of the world, surrounded by oceans teeming with life. With their vast, icy landscapes and long periods of darkness or daylight, the polar regions can appear pretty much the same.
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