Is it even possible for a new hatched chick to have a worm that long???? Wouldn't it take longer to grow that size then the chick has been alive????
I know this sounds silly, but that looks almost like they ate something they shouldn't have. I have no idea how that could have happened, so I'm probably wrong. I know you wouldn't have let them eat something odd. I don't see how it could have happened in transit or at the hatchery. That looks like what my cat pooped out after eating string. Probably just strange looking mucus.