It doesn't seem to matter here whether there are peanuts in shell, out of shell, none at all, corn, birdseed, etc. They bury all of it... Even the stuff that is small. The problem is that it makes it difficult to plant vegetable beds as they get dog up before the plants can get established. At times even established plants are dug up. Additionally, efforts to give them plenty so they don't dig up crocus failed. Diversity of food bribes or quantity of foods did not seem to matter either
