maybe someone here knows, but i just got back from hunting and my partner shot a very nice caribou bull, the hide was thick and full so i decided to bring it back. during the skinning i noticed what i thought was a bot fly larve in the skin, i cut it loose and looked at it, small black pupae looking thing about the size of a jelly bean. is it a bot fly? can i even use this skin for tanning or is it toast? if there are flies in the skin is there anything i can do to save it. its in the freezer now in a trash bag, so they probably wont live through that, but i cant be sure, any help is appreciated. and......... the skin has lots of yellow/blood looking spots on the inside, is this where the flies are?