Volume 18, Issue 2, Pages R57-R60 (January 2008) Biological invasions  Jonathan M. Levine  Current Biology  Volume 18, Issue 2, Pages R57-R60 (January 2008) DOI: 10.1016/j.cub.2007.11.030 Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 1 The Brown tree snake and damage from the balsam woolly adelgid. The Brown tree snake (Boiga irregularis) has devastated populations of forest-dwelling vertebrates on the island of Guam, while the balsam woolly adelgid (Adelges piceae) has killed large stands of adult Fraser Fir trees in the Appalachian mountains of the United States. Credit to John Fowler and Todd Long for the left and right images, respectively. Current Biology 2008 18, R57-R60DOI: (10.1016/j.cub.2007.11.030) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 2 Different stages of the invasion process, with the tall form representing the invader. Current Biology 2008 18, R57-R60DOI: (10.1016/j.cub.2007.11.030) Copyright © 2008 Elsevier Ltd Terms and Conditions