Rats

A common house pet, rats are one of the most destructive vertebrates. For starters, when introduced into locations where rats previously did not exist they can cause a huge amount of environmental degradation. In fact, the black rat is considered to be one of the worlds most invasive species and has contributed to the extinction of many wildlife species including birds, reptiles, small invertebrates and even mammals. Aside from its invasive nature, rats are also know to carry diseases such as the bubonic plague, Lassa fever, leptospirosis, and Hantavirus infection.