One of my RIR's has very loose reddish-brown droppings. Yesterday while free ranging in my back yard her dropping was clear and watery with a few grains in it. She isn't acting sick. She isn't egg-bound that I can tell. I can't find lice or mites on any of them. I haven't changed their diet of layer feed, sometimes cooked oatmeal with raisins on cold mornings, sometimes peas & a little corn mixed (unthawed and warmed up with warm water). They eat the occasional mealworms and crickets. Should I be worried?