2 of my 6 week old chicks are stretching out their necks and opening their mouths wide today and I am 99% sure they haven't eaten an earthworm. So is this a normal behavior or should I be worried. I have had them outside twice this week for about 4 hours each time and I was about 20 feet in range. Also, one of these chicks is very chirpy today. I thought it was just her being happy, but after just watching them I noticed this behavior.