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