There are approximately 200 different species of mosquitoes in the United States -- all of which live in specific habitats, exhibit unique behaviors, and bite different types of animals. Mosquitoes are insects that have been around for millions of years. During this time, they have been honing their skills so that they are now experts at finding people to bite. A mosquito has a battery of sensors designed to track their prey, including chemical, visual, and heat sensors. Sweat, clothing that contrasts with a background and heat attract mosquitoes. Be aware of these sensors in order to protect yourself and your pet.