Yosemite isn't the only victim of American bullfrogs' invasive nature. In fact, the bullfrog is one of the top 100 world's worst invasive species, according to the Global Invasive Species Database.

You can see -- and hear -- the invasion happening in several lakes and ponds around Victoria, Duncan, Nanaimo and Parksville this summer. The intruder is the American bullfrog, and its distinctive ...

BILLINGS — Scientists say an invasion of voracious American bullfrogs is spreading downstream along Montana's Yellowstone River and poses a potential threat to native frogs.

The national park previously conducted a massive bullfrog eradication effort in Yosemite Valley — in part to save the pond turtles — but it was too late. The turtles couldn't stage a comeback ...