So I am very new to raising chickens. I have 10 1.5 week old RIR, RIW & 8 baby Roos. On nice days we take them out to their run to get some exercise and scratch. One of my girls seems to lay down in the dirt and either take a dirt bath or make a nest in the dirt. Is this normal chicken behavior? It's pretty funny to watch her- my kids get a kick out of watching her.