RE: squirrels and rabbits?
Warbles, Worbles, Wolves or Wolf worms (there may be other names depending on where you live) are the larva of a fly. The fly lays an egg in an open wound or in the nose or other natural opening and the egg hatches. The larva grows until it is ready to change into a fly and then works its way through the skin to the outside. The first hard frost kills the flys that lay the eggs and the problem goes away until next season. The larva are not harmful to you, remove them when you skin the rabbit or squirrel and cook as usual, no problem. They are disgusting to look at but harmless. Go to any farm in the summer time and you will see them on the backs of cattle that have been exposed to flys (large round lumps on the backs). Go hunting and have a good time, eat what you kill.
Coastie
"Count the day lost whose low, descending sun
is not, in part, obscured by powder from my gun,"
(Anon)