Traveling across the ocean is a hard journey, but stowing away is pretty easy.
Last fall, hundreds of birders rushed to Bryher, a tiny island off the coast of Cornwall, England. They came to see a Blackburnian warbler, a bird with a flaming orange throat and a high-pitched, trilled song. Blackburnian warblers are hardly ever seen in the United Kingdom—their home is 4,800 kilometers away in the pine forests of North America. Though they’re adept fliers, these birds typically overwinter in South America.
The phenomenon has a name: ship-assisted migration. But few researchers paid much attention to how frequently birds hitchhike on ships—at least in a systematic way—until Maurizio Sarà took a month-long research cruise in the Mediterranean. Even counting only the commercial shipping fleet, around 90,000 ships are regularly crisscrossing the world’s waters. Sarà speculates that birds developed a new migration strategy for this modern era, one where they use the abundant freighters, tankers, and cruise ships as stepping stones on transcontinental flights.
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