While the infestation is usually confined to a single larva, the resulting cyst can be painful and unsightly, often oozing a clear fluid that resembles the leakage of a boil. This is when adult flies are most likely to be seen flying near the ground, where their rodent hosts reside.
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These parasitic insects, unlike their common housefly relatives, engage in a grim lifecycle that involves using warm-blooded hosts, including humans and livestock, as a nursery for their developing larvae. Adult bot flies do not feed or sting; their sole purpose is to reproduce.
Finally, livestock are heavily impacted by flies in the genus _Hypoderma_, such as the cattle grub, which targets cattle and other bovines. _Dermatobia_ flies, conversely, attach their eggs to the abdomen of a blood-sucking insect like a mosquito.
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The eggs hatch, and the first-stage larvae wait for a host to brush past, at which point they latch on and migrate through the skin to eventually form a visible swelling under the surface. When the mosquito bites a human or animal host, the body heat triggers the bot fly egg to hatch, and the larva penetrates the bite wound.
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