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The adults are roughly 1.5 to 4 mm in length and are laterally flattened. They are dark brown in color, are wingless, and have piercing-sucking mouthparts that aid in feeding on the host's blood. Both genal and pronotal combs are absent and the adult flea has a rounded head. Most fleas are distributed in the egg, larval, or pupal stages.
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Although fleas cannot fly, they have developed powerful legs and are famous for being able to jump quite high in proportion to their tiny bodies — more than 100 times their body length, up to a ...
The infected fleas feed on rodent vectors of this bacterium, such as the black rat, Rattus rattus, and then infect human populations with the plague, as has happened repeatedly from ancient times, as in the Plague of Justinian in 541–542. [46] Outbreaks killed up to 200 million people across Europe between 1346 and 1671. [47]
A single female flea can mate once and lay eggs every day with up to 50 eggs per day. [ 5 ] [ 6 ] [ citation needed ] Experimentally, it has been shown that the fleas flourish in dry climatic conditions with temperatures of 20–25 °C (68–77 °F), [ 7 ] they can live up to a year and can stay in the cocoon stage for up to a year if the ...
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Fleas (Siphonaptera) such as Echidnophaga gallinacea, range from 2–6 millimetres in length and have bodies which are flattened laterally or appear compressed horizontally when viewed from above. [ 9 ] [ 12 ] The flea's body is designed to easily travel through hairs or feathers, allowing free movement throughout the host's body.