We euthanize with a CO2 chamber. After that, depending on the size of the prey (almost always weans-smalls right now (rats)), they get "layered" in 1 gallon freezer-gaurd Ziplocs. I freeze mine all in one clump and they dont stick at all. I pack them tight to get the air out and place them as deep in the freezer as possible. After they are frozen through they get moved to the door for easy access. If you are freezing younger prey, especially pinks, they will stick together with this method. Once their fur is in, we have never had any problems with them coming out in clumps at feeding time.
Our "layering" is belly up for the bottom layer, then belly down, belly up, etc. Also, we usually put them butt to head to more efficiently use the space in the bag. As long as you bag them quickly after you euthanize them, their muscles will not set into rigor and you can place their snouts into the crevice of space created on the sides of the bag. It sounds bad, but it really does save a lot of space.
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