Livestock may carry invasive species on their fur, in their hooves, or in their digestive systems. Plant seeds also may get mixed up in their feed or in other materials such as fertilizer (made from their waste) or fill dirt.
Species that may be introduced by this pathway include common crupina, knapweeds, leafy spurge, Scotch thistle, tansy ragwort, and yellow starthistle.
If you’re a farmer or rancher with livestock or you take pack stock out on trails, you can help prevent the spread of invasive species by cleaning your animals and by using certified weed-free feed.
For more information, see the following Web sites: