First, I just started with Chickens in mid-December. I have some very young pullets that I watch as they play, spar and scratch. The day before yesterday I adopted two adult hens and they are scratching around for food, it's amusing to watch for a new chicken owner. But here is my question: They are going pretty deep...about six inches thus far. Is this normal? How far do they tend to go? I keep them in my backyard and I don't want a yard full of pot holes...a little "tilling" is ok but six inches may be more than I am comfortable with. Is there a way to minimize the damage to my backyard?