"Invasive species are a serious challenge for our parks and connected ecosystems,” the National Park Service website states.

They are now "one of the most abundant birds in North America," said the New York Invasive Species Information. The birds "compete with native species as well as destroy crops," and are "prolific ...

(KOIN) — The Oregon Department of Fish and Wildlife is educating the public about some of the state’s most harmful invasive species ... shellfish and birds – that clean sea water, absorb ...