Australia imported foxes for sport in the 1800s; within decades, they became a major threat to native wildlife

Introduced to Australia for fox hunting in the 19th century, red foxes spread across the continent and became a major threat to native wildlife, livestock and threatened species.
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In the 1800s, red foxes were brought to California for hunting. Decades later, the light-footed Ridgway’s rail declined to just 5 breeding pairs

A red fox introduced to California more than a century ago might seem far removed from the fate of a small marsh bird. Yet the two became linked in the coastal wetlands of Southern California, where ...