invasive species

Invasive animals are posing a major threat to national parks throughout the country, according to a new paper published in the journal Biological Invasions.

Ashley Dayer, the study’s lead author, says her team received data from 81% of national parks and found there are more than 300 invasive animal species across the National Park Service system.

Shana Welles

A new species of tumbleweed is more vigorous and invasive than ones we've seen in the past. Its range could spread throughout the Mountain West. 

In an open field in Longmont, Colorado, about a dozen people crouched in the tall grass, moving slowly and deliberately through mud that squelched underfoot. Some carried huge, serrated knives called hori-hori, a Japanese tool made specifically for gutting weeds. Others wielded gardening shears, saws or chemical sprays as their weapons of choice.

Western governors want to see more federal action to combat tiny but destructive creatures: invasive mussels.

A quagga mussel is only about the size of your thumbnail. But when the little mollusk reproduces en masse, it can wreak havoc on agriculture and lake tourism.