I had a chick just last month who made poops like that! At first I was freaked out by it, but upon disecting it (I know-- gross, but I'm the scientific type), it just looks like "poop sausage". It is like it's encased by intestinal mucus or something to hold the poop in that worm-like shape. Mine too was a newly hatched chick which I had hatched at home from my own flock. after a couple of weeks its poop didn't look like that anymore. He's also the most tame, vigorous, robustly healthy acting bird that I have of his age. I really doubt that they are actual worms. those worms would be much too large to be living in the intestines of a day old chick. It takes at least a month for any worm to grow from worm egg to that size. they live off of digested food, don't they? chicks don't have any food in their intestines before they hatch, do they? and yes, intestinal parasites end up in the intestine because they were ingested. Good luck with this and I hope that what I wrote makes sense to you.
