Most of us have heard a few of the theories that are offered to explain how birds are able to migrate for thousands of miles to an exact spot. The arctic tern migrates 22,000 miles a year to winter in the same spot where it wintered the previous year. But most birds seem to have this amazing ability even if they don't use it as often or to travel as far.

Ref: Cook, Patrick. "How do birds find where they're going?" Science 84. p. 26. Image: P puffinus griseus (PD)

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