We always called those botfly larva "wolves" around here, and they're in a good percentage of rabbits and squirrels until it gets cold and frosty in the fall. They won't hurt the meat at all, they just look gross. You can trim around them. Almost every wild animal has a whole ecosystem of parasites living in it-deer have specialized worms that live in their nostrils, brains, and even velvet antlers. I'm just glad that we don't have the human botfly here like they do in South America and Africa-they do the same thing, but to people.