I also vote for Black Soldier Fly larvae. I am in CA and the BSF find my compost bin. I built what I thought was going to be a worm bin for all our kitchen waste, to keep the waste... and hopefully the rodents... out of our compost bin. Only yard waste goes into our compost bin now. The 'worm' bin I built is actually a set of stacking bins, discarded fence board sides and mesh bottom, solid lid on top of stack. The BSF found this setup also so I drilled ... less than 1/2" ?... holes in the side to make it easy for the BSF to get in. Caught a rat in a snap trap and put it in the very active bin and the rat was unrecognizable the next day. And the beautiful thing about this bin? The BSF larvae crawl out the bottom (YES, they do NOT need a ramp of a particular angle to crawl out of the waste space) through the mesh and the chickens do their own scavenging of the larvae, no collection necessary on my part. It is January in CA now and I've seen very few BSF larvae in this bin so I just add another bin on top if a bin gets full of kitchen waste. I have 5 total, but have never needed to add the 5th one. When the weather warms up again, the BSF will plow through the goodies in the bin in no time. Not sure if you want offal sitting in a bin all winter until the BSF return, but by the time I'm done parting out a chicken for meals and stock, I wouldn't mind putting what is left into my bin until my BSF workers return. Might be a different story if I were concerned about a sick animal.