Behold: There's a new long-distance champion of the world.
A gray whale has broken the record for mammal migration, swimming a jaw-dropping 13,988 miles - equivalent to swimming halfway around the world. The round-trip marathon from Russia to Mexico and back took 172 days. What's more, the whale never once stopped to feed.
Researchers from the Marine Mammal Institute at Oregon State University made the discovery after tagging the whale, dubbed Varvara, with satellite devices off the coast of Sakhalin Island in Russia. Soon enough, they could determine that Varvara had ended up in sunny Mexico, after a long journey through the Bering Sea, Gulf of Alaska and all down the California coast.