|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Flea is the common name for insects of the order Siphonaptera. They are wingless insects with mouthparts adapted for piercing skin and sucking blood. Fleas are external parasites, who live by sucking the blood of mammals that include including bats, humans and birds.