I know what El D's talking about. The Old timers around here called them "wolves" they are a parasite that sometimes get inside squirrels and rabbits during warm weather. I believe they're actually Bot fly larvae. I've killed both rabbits and squirrels that had them. I didn't eat them, but I really doubt it would harm you if you did.
Most people don't know it but most deer have Bot fly larvae in them...even during hunting season. And we still eat them anyway.
"When you're hungry, season's always in"