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The Human Flea (Pulex irritans) is a wingless insect that
attacks humans, but it will also live on the blood of many other
animals. It is a major cause of the spread of disease. Infestations of
human fleas are less of a problem in societies where personal hygiene
dictates frequent bathing and adequate clothes laundering. Fleas are
small, black to brownish-black insects. They have stout, spiny legs,
adapted for leaping, and short, 3-jointed, clubbed antennae that fit
into depressions along the sides of the head. Their potentially long
pupal stage, besides the fact that adult fleas can live without food for
remarkably long periods, accounts for the fact that people may enter a
house after it has been unoccupied by humans or pets for months, yet be
rapidly and severely attacked by fleas. Depending on the species and
weather conditions, 2 or 3 weeks to as many months, and rarely as long
as 2 years, are required for many species of fleas to complete a life
cycle.
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Click on pictures to enlarge
Source: Jan Sovak,
Dover
Publications,
and the Internet

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