These flies are large, robust, and bear a resemblance to bumblebees, which can lead to confusion. 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.
North America Bot Fly Species Overview: Identification, Habitat, and Lifecycle
Populations of _Cuterebra_ thrive in woodland areas and grasslands across the United States and southern Canada, with peak activity occurring during the late spring and summer months. While the thought of a fly laying eggs on you or depositing larvae under your skin is unsettling, understanding the biology, geographic range, and prevention strategies for North American bot flies is crucial for mitigating the risks they pose to both human comfort and animal health.
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. This is when adult flies are most likely to be seen flying near the ground, where their rodent hosts reside.
North America Bot Fly Species Overview
When the host passes by, the warmth triggers the eggs to hatch, and the larvae use tiny hooks to burrow into the skin. These flies are typically found in rural and suburban areas where their primary hosts—rodents like mice and squirrels—are abundant.
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