Bot flies are indeed found in the United States. The specific species of bot fly most commonly encountered in the US is known as Cuterebra fontinella. This particular bot fly species has been reported to occur in various regions across the country, with the exception of Alaska. It can be found in most parts of the continental US, including states such as California, Texas, New York, Florida, and many others.
In addition to the US, Cuterebra fontinella has also been reported in southern Canada and northeastern Mexico. This suggests that the range of this bot fly species extends beyond the US borders, making it a notable insect across North America.
One of the distinguishing characteristics of Cuterebra fontinella is its relationship with small mammals, particularly rodents. The bot fly larvae of this species are parasitic and require a host to complete their life cycle. Adult female bot flies lay their eggs near the entrance of small mammal burrows or in the surrounding vegetation. When a potential host, such as a rodent, passes by, the eggs hatch and the larvae attach themselves to the host’s fur or skin.
Once attached, the bot fly larvae burrow into the host’s body through natural openings or wounds, where they continue to develop. The larvae form a distinctive swelling or warble under the host’s skin, which serves as a protective environment for their growth. Eventually, fully developed bot fly larvae emerge from the host, drop to the ground, and pupate before transforming into adult flies.
While the presence of bot flies in the US may not be a cause for major concern, it is worth noting that these insects can occasionally affect domestic animals, including cats and dogs. Pets that spend time outdoors, especially in areas where bot flies are prevalent, may be at risk of becoming hosts to these parasites. Regular grooming, particularly checking for and removing any bot fly larvae, can help prevent infestations in pets.
Cuterebra fontinella is a common bot fly species found in many parts of the United States, except Alaska. It is also reported in southern Canada and northeastern Mexico. These bot flies have a life cycle closely associated with small mammals, particularly rodents. While they generally pose no significant threat to humans, pet owners should be aware of the potential risks to their animals and take appropriate preventive measures.