I just noticed one of my Australorp chicks twitching her head and gaping. No noise came from her mouth. She is eating, drinking and otherwise acting normal except every so often she will do this. I have 8 chicks total and they have had earthworms twice in the past 3 days. Am I overreacting or could this be gapeworm? Any other symptoms I should look for or am I just an overprotective, worried new chick owner?