I read in another post that you should not feed chicks (mine are four and a half weeks) live mealworms. Something about the heads being too hard or the worms eating through their stomach? Is this just one of the many myths about what not to feed them? I have been giving live mealworms for a few days now but am second guessing my decision. If it is true can someone point me to a link with evidence? They sure do love them.