Sources for Headline Text Images in Invasive Species: Friends or Foes?

http://www.nytimes.com/2005/03/20/nyregion/where-we-live-allgarden-alert-aliens-have-landed.html

http://forestry.about.com/od/forestinvasives/p/tamarisk.htm

http://highlandscurrent.com/2016/11/invasive-plants-gone/

http://www.chicagotribune.com/lifestyles/home/ct-home-1031-garden-qa-20141024-story.html

http://www.greatfallstribune.com/story/news/local/2016/11/09/invasive-mussel-larvae-discovered-popular-montana-waters/93561824/

http://www.postguam.com/news/local/brown-tree-snake-causes-brief-power-outage/article_68ec3d26-39d5-11e6-91d0-d36c4acaa642.html

http://www.guampdn.com/story/news/2015/08/25/more-funding-eliminate-brown-tree-snakes-0826/32037271/