* North America: They were introduced to the United States in the 1500s, and they have spread throughout much of the country.
* South America: They are found in several South American countries, including Brazil, Argentina, and Colombia.
* Australia: They were introduced to Australia in the 1800s, and they are now considered a major pest.
* New Zealand: They were introduced to New Zealand in the 1800s, and they are now found throughout the country.
* Africa: They are found in parts of Africa, but they are not native to the continent.
So while they originated in Eurasia, they are now a significant invasive species on several other continents.