I have four 9 week old chickens, only one is a bantam. They are usually in their run but occasionally when I am able to stay in the yard (small and suburban) with them I will let them out for a bit before they go to bed. Tonight when I did that I heard 4 very noisy crows land in a nearby tree. The tree is in my neighbors yard but only about 20 feet away. I was very nervous I had not seen or heard these crows before. I clapped my hands loudly, flailed my arms around and shouted at them. They finally flew off. Could they have been interested in my chickens? Are they all in danger from the crows or only the silky? Do crows attack in a group?