Whales leave DNA ‘footprints’ across the ocean. Here’s how we track them

Biological matter left behind in the water allows us to follow these animals without ever setting eyes on them.
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Mistral the whale shark's epic 1,200-kilometer international swim is the first such migration ever witnessed

Many animals are capable of extraordinarily long migrations, crossing many miles of Earth’s seas, skies, or scenery to reach breeding or feeding ground. While these journeys are impressive, there are ...