Last year at master gardener college, one of the classes was a visit to the composting area at Va Tech. The guy in charge there told us what they do and showed it to us. They have HUMONGOUS bins, about 30' cubes. They have perforated pipes (just that 4" to 6" corrugated stuff like you can get at Lowes or Home Depot) that they lay down first and blow air through them with a compressor once the stuff to compost is put into the bins. He said that a perforated pipe just laid underneath would do almost as good a job, in their experience when they've had their compressor out. Based on this, I leave a perforated pipe underneath my pile. Right now, the pile is so big from shredding 80-100 bags of leaves that it has over flowed the pipe ends. I need to turn it and uncover the pipe. Actually, I need some more pipe.
The guy told us that he'd composted whole cows in the bins and that the highway department composted road kill all the time in some of their compost areas. He says you can compost anything organic, e.g. not metal or plastic. If you compost stuff like this, you have to make sure that you get it to heat up (to around 140 F) and all to really cook and compost. Most people (like me) don't get it hot enough consistently; so, we caution people not to put animal matter into their piles.
Ralph