Fleas are wingless insects with mouthparts adapted for piercing skin and sucking blood. Fleas are
external parasites, living off the blood of mammals (including bats and humans) and birds.They are
small (1/16 to 1/8-
mouth-
adapted for jumping: a flea can jump vertically up to 7 inches and horizontally up to 13 inches.This
is around 200 times their own body length, making the flea one of the best jumpers of all known
animals (relative to body size).