One of my chicks keeps getting poo stuck on the feathers around her vent, but it doesn't seem to be actually blocking her vent. Do I need to worry if it's not actually preventing her from pooping? Should I just clip her feathers (I'm a little scared to)? How much water should they be drinking? Their poo seems plenty...moist I've got a 1 liter waterer, but the four of them haven't even gone through 1/4 of it.