We had an opossum in the coop this evening and thankfully I heard the commotion and got out there quickly. None of my chickens were killed and I looked them over one by one as best I could with a flashlight and I didn't find any obvious injuries. One of my girls whose feathers I suspect were the ones strewn about will require a closer look in the daylight and one of my roosters had a little blood on him, but I'm not sure if it was from the opossum as we shot it where it was cornered in the coop and it tossed about. I am wondering if I should give my flock a round of antibiotics just in case and which one I should use?