- Bilaterally-flattened wingless insects with enlarged hindlimbs specially adapted for jumping (up to 100 times their body length)
- There are some 2,500 flea species, most parasitic on mammals (especially rodents) and some on birds
[[File:PMC3309057 kjp-50-79-g002.png|thumb|Small black-colored cat fleas (Ctenocephalides felis) (A) and on microscope (B).
Domestic U.S. Ectoparasites
See also travel-related skin conditions