The maggots referred to are the myiasis-causing larvae of the human botfly ("Dermatobia hominis"). "Dermatobia hominis", the human botfly, occasionally uses humans to host its larvae. Gyrostigma is a genus of botfly which parasitize rhinoceroses. Occasionally, horse owners report seeing botfly larvae in horse manure. One of the most common parasites of eastern woodrats are botfly larvae. At least in some situations, "Philornis" botfly larvae heavily infest nestling birds. The Mexican spiny pocket mouse is parasitized by the mouse botfly, "Cuterebra fontinella". Cottontails can also be parasitized by botfly species including "Cuterebra fontinella". Syringes of this type are sometimes used for extracting human botfly larvae from the skin. "Cuterebra fontinella", the mouse botfly, parasitizes small mammals all around North America. Cotton mice are also parasitized by "Cuterebra fontinella", the mouse botfly. In northern Europe, the moose botfly is a parasite whose range seems to be spreading. Human ophthalmomyiasis, both external and internal, has been caused by the larvae of the botfly. A case has been reported of a sebaceous cyst being caused by the human botfly. The botfly will hijack a mosquito to inject the host with the eggs.