ORDER of FLEAS
Siphonaptera, order of fleas:
Species? Twenty-five hundred of these.
Each selects its key host,
Feeds and breeds, then can boast,
"We bring itch, infestation, disease."
Ectoparasites, sure to displease.
Authors' Note: The fleas, wingless blood-sucking hopping insects, infest and make miserable a variety of warm-blooded host species including most famously man and dog. In America, the vast majority of infestations of domestic pests involve the cat flea, Ctenophalides felis.