Two of my sex links have runny poops. Dried poop is on their back tail feathers. I checked their vents and they are clean. It just leaves dried drips of poo on the way out. Should I worry, or is this totally normal? I did notice some eggs are a bit dirty when I gather them in the morning, but its very small and nothing I am too grossed out about. I'd like to prevent a problem if this is a sign of something! Thanks!