I have 28 chicks. Right now they mostly stay in their coop, occasionally going out into a baby gated pen (with nothing on top) with me there to supervise. When they get older I would like to let them free range around my yard but we have quite a few outdoor cats in my neighborhood. Right now we do not have a fence on one section of our yard (soon to be rectified). Since getting the chicks we have seen one cat actually in our yard, so thus far it hasn't been a huge problem however we would hate for it to become so. How big of a problem are cats? I noticed in the poll cats only account for 1% of the vote for worst predator. Is there anything to discourage them? Are they a threat to full grown hens?