LAST BUT NOT LEAST!!!!!
No 1: The mosquito
Yes, the humble mosquito. What we Brits regard as an annoying pest is actually the most dangerous creature on the planet, thanks to its ability to spread disease with alarming efficiency. Best known for spreading deadly malaria, mossies also spread elephantiasis, yellow fever, dengue fever and West Nile virus, which was recently introduced to the US and is now prevalent in all states.
Responsible for: An estimated 2-3 million fatalities a year.
Hangs out in: Worldwide; harmful in Africa, Asia and North America.
Method of dispatch: Using serrated mouth parts, female mosquitoes pierce the skin and inject saliva containing a thinning agent to liquidise the blood. Most people won't know that they have been bitten until the immune system reacts, resulting in red, itchy bumps that continue to itch for days after the initial bite.
Useful avoidance techniques: Mosquito nets treated with DDT are the most effective way to keep them at bay, as well as combative sprays and treatments that can be applied directly to the skin. Wear light-coloured, long clothes in the evening. If travelling to malaria zones, ensure that you take your full course of tablets before, during and after your stay.