Photo: Australia's "Road Warrior" Toads Get Arthritis

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Many of Australia's invasive cane toads—built more for sitting in the swamp than marathon migrations—are developing arthritis, a new study says.

Even so, the invasive amphibians native to South America are rapidly spreading through Australia's Northern Territory at a rate of up to 37 miles (60 kilometers) a year.

Photograph courtesy Matt Greenlees

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