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Several possible causes have been advanced for the Black Death; the most prevalent is the bubonic plague theory. [3] Efficient transmission of Yersinia pestis is generally thought to occur only through the bites of fleas whose mid guts become obstructed by replicating Y. pestis several days after feeding on
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 earliest known fleas lived in the Middle Jurassic; modern-looking forms appeared in the Cenozoic. Fleas probably originated on mammals first and expanded their reach to birds. Each species of flea specializes, more or less, on one species of host: many species of flea never breed on any other host; some are less selective.
Tunga penetrans is a species of flea also known as the jigger, jigger flea, chigoe, chigo, chigoe flea, chigo flea, nigua, sand flea, or burrowing flea. It is a parasitic insect found in most tropical and sub-tropical climates. In its parasitic phase it has significant impact on its hosts, which include humans and certain other mammalian species.
The human flea (Pulex irritans) – once also called the house flea [1] – is a cosmopolitan flea species that has, in spite of the common name, a wide host spectrum. It is one of six species in the genus Pulex ; the other five are all confined to the Nearctic and Neotropical realms . [ 2 ]
The bluish-green glow is attributed to luciferin, which emits light after oxidation catalyzed by the enzyme luciferase. Some believe that the light attracts insects to spread spores, or acts as a warning to hungry animals, like the bright colors exhibited by some poisonous or unpalatable animal species. [ 2 ]
Bed bugs are attracted to their hosts primarily by carbon dioxide, secondarily by warmth, and also by certain chemicals. [ 4 ] [ 22 ] [ 23 ] [ 24 ] There is strong evidence that bed bugs can respond and orient towards human odors, independently of all other host cues. [ 25 ]
Long before "Twilight" put Jacob on the map, werewolves have been the subject of countless movies, books and monster tales.. In fact, much like ghosts, witches and vampires, the werewolf has been ...
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