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Across the world, migrating animal populations are dwindling. Here's why

Ninety-seven percent of migratory fish species are facing extinction. Whale sharks, the world's largest living fish, are among the endangered. (Ullstein Bild)
Ninety-seven percent of migratory fish species are facing extinction. Whale sharks, the world's largest living fish, are among the endangered. (Ullstein Bild)

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