The Gray Whale is the 10th largest creature alive today, and the 9 creatures larger than it are all whales, too. Gray Whales are known for their epic migration routes, sometimes covering more than 16,000 km (10,000 miles) on their two-way trips between their feeding grounds and their breeding grounds. Researchers don’t have a complete understanding of how whales navigate these great distances, but some evidence suggests that Earth’s magnetism has something to do with it.
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