Nah. Most spider species aren't dangerous at all, and even the really poisonous ones are only a problem if they bite the chicken, which isn't likely to happen while a chick is tearing it apart to eat it. My chooks find and eat black widows sometimes.
That darn spider survived 6 baby chicks! They even saw it! It crawled on their feet and all! I told the birds they had to go if they would not eat spiders! Anyway, i even killed and tried to show it to the girls. Not one taker. This is bad news! On the other hand, my garden should do well!
LOL! Your babies sound like mine. It's like they can't figure out they're supposed to eat anything other than their starter. They did eat a worm when I took them outside so I have hope, but they have no interest in anything else I've given them!