Flea is the common name for insects of the order Siphonaptera which are wingless insects with mouthparts adapted for piercing skin and sucking blood. Fleas are external parasites, living by hematophagy off the blood of mammals (including bats and humans) and birds.
Some flea species include:
Cat flea (Ctenocephalides felis)
Dog flea (Ctenocephalides canis)
Human flea (Pulex irritans)
Moorhen flea (Dasypsyllus gallinulae)
Northern rat flea (Nosopsyllus fasciatus)
Oriental rat flea (Xenopsylla cheopis)
Over 2,000 species have been described worldwide.