You can put fats and meats in your compost. The main objections to fats and meats have always been that they attract animals. If rats, dogs, etc. aren't a problem, neither is fat in your pile.

The only thing you can't put in a pile is bread, but that's not because of any ingredient in the bread, that's because bread in the compost pile is soggy, disgusting, nauseating, stomach-turning, unsavory, gross, puffy, revolting, and speaks volumes about one's sense of right and wrong. To say nothing of planarians.

I'm happy to say I don't know what your grubs are. Their skeletons, though, are probably a great contribution to your pile.

Likely some kind of fly maggot - common to piles that are too wet. All sorts of flies are attracted to wet compost to lay their eggs. ;)

In the long run they are not harmful to the compost in any way but you may want to let your pile dry a bit to discourage them.

Dave

More than likely, you've had soldier fly larvae. They belong to nature's Compost Crew.

They're typically present when the composting stuff is on the wet side.

Its probably BSF larvae, and though gross, they are great consumers of organic material...they eat, they poop and they fly away...the poop is a good thing, as are the little shells that they leave behind.

I've heard people say, similar to jean, that they can be an indication of wet compost...but I keep my pile on the dry side and I still have them every once in awhile.

They are common in a working pile because they like warm, moist decaying organic matter.

Here is a link that might be useful: black soldier fly

i've changed so urine is the biggest pctage of my greens, i don't get a whole lotta stuff like that. how hot can u expect a compost to get in 45 degree weather, can it reach 160? i don't have a very good thermometer, a 6 inch one.....i don't think it's accurate, but it's readn 120. better than nothin :S

Meats and fats should not be added to compost because the bacteria that digest the compost get indigestion from them, those bacteria find it extremely difficult to digest meat and fats, not because those things might attract animals you would not want although they will and do.
Maggots on your compost indicate the compost is too wet to properly digest, ie. there is a problem that needs to be corrected. Maggots do not belong in compost.

Kelly Slocum a vermiculture expert knows tons about worms and maggots. I would suggest anyone curious about BSF read this thread, where she posted information about BSF:

Here is a link that might be useful: BSF

kimmsr, tell a dead squirrel out in the woods under a pile of fall leaves that he's doing it wrong.

You can pretty much take your cues from nature. If it falls on the ground naturally, it's pretty much okay to compost.

Meat is a heady green. Make sure that anyone you don't want at your pile can't smell it.