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Fleas are wingless insects, 1.5 to 3.3 millimetres (1 ⁄ 16 to 1 ⁄ 8 inch) long, that are agile, usually dark colored (for example, the reddish-brown of the cat flea), with a proboscis, or stylet, adapted to feeding by piercing the skin and sucking their host's blood through their epipharynx.
The larva of the cat flea has a grub-like appearance and is ~2 mm in length. The larvae are negatively phototaxic/phototropic, avoiding light and hiding in the substrate around them. The larvae require adequate ambient moisture and warmth, and will die at temperatures near freezing. [8] Cat fleas prefer soil moisture content between 1-10%. [12]
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.
There are more than 2,000 species of tiny (0.04 to 0.15 inches), wingless, blood-sucking fleas that live on the body of the host they infest. ... (20-100 cases a year in the U.S.) caused by the ...
Being able to tell the difference between, say, a fleabite, a bed bug bite, and a mosquito bite can mean the difference between an infestation (fleas, bed bugs) and figuring out whether the ...
Some people think there are insects called sand fleas that bite you. But some experts say the creature that bites you and the sand flea are likely entirely different beasts.
Light is one of the most defining environmental factors that determines an animal's activity pattern. [5] Photoperiod or a light dark cycle is determined by the geographical location, with day time being associated with much ambient light, and night time being associated with little ambient light. [5]
[22] [23] From 1960-2013 ranges have shifted poleward by 2.7 ± 0.8 km (1.68 ± 0.50 mi) per year - albeit with significant differences between taxa. (Especially in the case of viruses and nematodes which show the opposite trend, toward the equator .
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