I'm lazy. I built a chicken wire cage a couple of feet long and eight or nine inches in diameter. After spring finally gets here, I set my frozen skulls into the cage and wire the end shut. The cage is fastened up in a tree in the rear yard. As soon as those skulls start to thaw, the flies home right in on them. The magots do a fine job on them, inside and out. After the leaves drop, the skulls get sun bleached all winter. I just brush them up with an old tooth brush. I don't go for that plaster white look. I like mine to look like real bone. I once boiled a porcipine skull and I boiled the teeth right out of it. Didn't know what they were at first. The bottom ones are as long as the lower jaw bone is. Top ones orginate somewhere back there too. I like my magot method better. Frank.