Fleas are small, wingless, laterally compressed blood sucking insects. Most fleas are mammalian ectoparasites but a few parasitize birds. About 2400 species are known. Like most parasites, fleas are highly derived and specialized. The mouthparts are adapted for piercing and sucking and mandibles are lacking. The cuticle is sclerotized and hard and the entire body surface is protected by sclerites.

Related categories 4

Cat Flea
Popular article about fleas, their evolution and life cycle, and the cat flea Ctenocephalides felis, its host finding and control.
Ctenocephalides canis
Photographs of the dog flea. Click to enlarge.
Ctenocephalides felis
Several photographs of the cat flea, its larvae and pupae. Click to enlarge.
Ctenocephalides felis and Pulex irritans: Cat Flea and Human Flea
Photograph of a flea, with information on its hosts, life cycle and description.
Ctenocephalides felis: Cat Flea
Photographs and a description of this flea, its distribution, life cycle, medical and economic significance and management.
Ctenocephalides felis: Cat Fleas
Research project by Hoi King Kwong on these parasites including their classification, morphology, habitat, reproduction, adaptations, nutrition and interactions with other species.
Flea
Scanning digital micrograph.
Flea Circus Research Library
Flea Circuses and performing fleas in history, film and fiction. Including a directory of real and "humbug" flea circus performers.
Fleas
This article describes these pests, their biology, importance and control measures.
Fleas
Article by P.G. Koehler about flea biology with photographs and information on their control.
Fleas (Siphonaptera)
Zoological Institute of Russian Academy of Sciences (St.Petersburg, Russia) presents information on morphology, biology, distribution and importance of fleas (Class Insecta: Order Siphonaptera).
Insect Insights: Flea Circus
Photographic study by Dave Walker of these insects.
Introduction to the Siphonaptera
A brief introduction to fleas by UCMP Berkeley, with photograph.
Pulex irritans
Photograph of the human flea with its identifying features. Click to enlarge.
Siphonaptera: Fleas
The characteristics of these wingless insects, their life cycle, feeding and habitat, with illustrations.
Tunga penetrans
Photograph of the sand flea or chigger, with its identifying features. Click to enlarge.
Xenopsylla brasiliensis
Photograph of this flea. Click to enlarge.
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