Early American humans hunted car-size armadillos and used their shells for houses.
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The largest earthworm on record was found in South Africa and measured 22 feet.
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There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
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The most expensive cow in the world was sold in 2009 for $1.2 million.
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