I was sitting here on the computer and looked out the window to see our coop and run. It is not covered so I have been letting them play during the day and bringing them inside at night. Anyways, I saw something fly over our fence and I just figured it was a dove or something. We have feeders in our backyard. then 2 huge crows/ravens landed on the top of our coop and looked down at my babies. I jumped up and let our german shepherd outside so he would scare them off. I haven't ever heard of crows attacking chickens but I wasn't about to take any chances. Should I be worried? Are they really dangerous?