That's adorable! Love that cat 

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Robynz, how old are yours?
Its interesting that I should see this thread today. I live in a very urban section of my city and any time before yesterday my answer would have been very different. Yesterday changed that for me. Like you, I haven't seen anything, and my main concerns are neighbor dogs and cats. But yesterday as I was driving home from work at 4PM, I spotted a raccoon two blocks away from my house. It darted into the bushes when it saw my car coming. Later that evening 6-7PM, while walking my dog, I saw a second Raccoon about three blocks away in the opposite direction. I have never noticed raccoons before and would have sworn under oath that my area was raccoon free. I was dead wrong. They have always been there, I simply never noticed them before.
You have predators in your neighborhood, you simply haven't had to keep an eye out for them before. Now that you have chickens, you will be on the look out for them and will begin seeing them. The two big chicken killers seem to be Raccoons and Neighbors Dogs. I know from first hand experience that raccoons are out and roaming as early as 4:00 in the afternoon, and neighborhood dogs are in the backyards almost all day. Ive also had raptors perching in the trees eying my Chickens in the past as well.
You can do what you want with your own chickens, but in my opinion its not wise to let them outside unsupervised.
Just my 2 cents.
Riki