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Arctic Tern - EnchantedLearning.com It flies over 21,750 miles (35,000 km) each year - roughly the circumference of the Earth. This excellent flier spends most of its life flying. This tern always experiences long days, since it spends the summer in the Arctic and the (Northern Hemisphere) winter in the Antarctic.
These social birds live in large groups, called colonies. Immediately before beginning a migration, a noisy colony of birds suddenly becomes quiet, and they all take to the air and fly away (this behavior is called "dread").