American and European eels are born in the same place, a seaweed-rich plot in the Atlantic Ocean called the Sargasso Sea. From there, they go their separate ways: Europeans head east and, in true Oregon Trail fashion, the Americans go west. All adult eels return to the Sargasso to spawn. How they navigate remains a mystery, though some speculate they rely on the Earth's magnetic field.
2. Bugs that use the Milky Way to navigate their poop balls
Elephants are capable of expressing grief. And when they come across the bones of their dead, they can identify them and pay homage, gently touching the skulls and tusks with their trunks and feet. They may even stay by the bodies of slain herd members for hours or days.
4. Butterflies that migrate for generations
Imagine setting off on a journey so long your descendants will be the ones to finish it. That's the monarch butterfly migration. Unlike other butterflies, North American monarchs can't overwinter. Instead, they fly south, some as far as 3,000 miles. It may be many generations before they return.
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