New species of tumbleweed is just as bad as its parents
![tumbleweeds](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/04/wt_tumbleweed_free.jpg?fit=860%2C460&ssl=1)
Tumbleweeds are icons of the American West, but they’re not native to the landscape. A study finds that a new species, discovered several years ago, is spreading.
Denise Rowlands/Flickr (CC-BY-NC 2.0)