Bullfrog invasion spreading along America's Yellowstone river

October 3, 2014 3:30 PM

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Bullfrog invasion spreading along America's Yellowstone river

BILLINGS, Mon. -- An invasion of American bullfrogs that will eat just about anything -- including each other -- is spreading downstream along the Yellowstone River in the northwestern state of Montana and poses a potential threat to native frogs, government scientists said.

Bullfrogs were found in recent surveys along a 100-kilometre stretch of the river from the Laurel area downstream to Custer, U.S. Geological Survey biologist Adam Sepulveda said Thursday. The number of breeding sites for the animals almost quadrupled between 2010 and last year, to 45.

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