Mosquitoes

Its difficult to grasp how such a small creature can be so destructive, but rest assured, the mosquito is by far the most destructive creature on this list. Even though the mosquito is incapable of causing any significant structural damage, it more than makes up for this by infecting over 300 million people a year with Malaria and Dengue, two life threatening diseases. Furthermore, in the United States, mosquitoes are responsible for infecting over 30,000 people with the West Niles Virus since 2001; 1,200 of which have resulted in death. Currently, mosquitoes have gained the spotlight thanks to their contribution in spreading the Zika Virus, which has been linked to thousands of birth defects.