John had told me earlier this season about the problem that chipmunks have with bot flies. I had never heard of bot flies in New England before — until I read Summer World. Heinrich writes: "I have also seen bot flies on skinned mice and chipmunks in Maine; relative to the size of their hosts, one of these maggots would be as big as a woodchuck to us."
Bot flies do not bite. They deposit their eggs in the nostrils of caribou in the arctic. When the eggs hatch, they wander around inside the caribou's body and then settle in under the animal's skin as they grow to be adults. Then they pop out of the caribou's skin and drop to the ground so that they can pupate.