The tamarisk tree was brought to the United States in the 1800s as a decorative tree, and it was also used to help stabilize the soil on rivers. The tree has thrived in the southwest, crowding out native trees. For many years, biologists have removed the invasive trees by digging them up or using herbicides In 2001, land managers began releasing imported salt cedar leaf beetles in an attempt to help stop the spread of the trees (tamarisk trees are also called salt cedars).

The beetles are doing their job more effectively than expected and have migrated up to 100 miles away from where they were released. Scientists are now concerned that species that have gotten used to the tamarisk trees may have trouble adjusting when the trees are gone. One example of this is the endangered southwestern willow flycatcher, which prefers nesting in tamarisk trees even when there are other native trees available.

Read more about this invasive species problem on National Geographic News.

Iggy Arbuckle has tried a similar trick to eliminate invasive species in the Kookamunga! Watch the video on National Geographic Kids.

Read more about invasive plants on National Geographic Kids.

Photograph by Michael Melford, National Geographic