zebra mussels

The threat of zebra mussels has prompted the federal government to temporarily ban watercraft from a Manitoba lake popular with tourists.

Parks Canada is closing all bodies of water in British Columbia's Kootenay and Yoho national parks, and restricting watercraft in Alberta's Waterton Lakes National Park in an effort to slow the spread of invasive species.

Minnesota pet owners warned not to release fish into the wild, where they wreak havoc on native species.

For two decades experts have been carefully nursing a community of endangered northern leopard frogs in B.C.'s Kootenay region but invasive bullfrogs and fish threaten to muscle in, potentially swallowing years of work.

"What are they doing over there? What are they thinking?" Mayors, scientists and environmentalists working on Great Lakes cleanup say cuts announced by U.S. President Donald Trump could be disastrous.