Which industry employed river pigs?

Logs are heavy. . . but they float. In its early 20th century heyday, the logging industry relied on river pigs to transport logs from camp to mill—a physically strenuous and extremely dangerous undertaking. Pigs needed brute strength as well as the sure-footedness and balance to cross over the bobbing, spinning timber; those who slipped were crushed on their way down to an icy death.

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