Biology
The Science of Bird Migration and Navigational Strategies Used
Quick fact
The Arctic Tern makes the longest migration of any animal, traveling an astonishing 30,000 kilometers (about 18,600 miles) each year—roughly Earth's circumference!
Why this is interesting
Every autumn, billions of birds vanish from your neighborhood, only to return in spring. How do these tiny creatures navigate across continents—and even oceans—without a map or GPS?