So yesterday I had the girls out of their run in my fenced in back yard. They were enjoying themselves tearing up my grass and garden. Suddenly I see four of my girls dash back to the run like chickens with their heads cut off. I see them all glaring up into the sky so I know something up. So I get up and look to a hawk up on the telephone pole staring down at my fifth chicken which was all alone (shes the smallest). I ended up throwing a rock up at the hawk which made him fly away. I then ended up putting my girls away for a little. The hawk wasn't very big, he maybe only stood a foot tall. Should I be worried about him attacking my girls? And why didn't my smallest girl run with the rest of the flock?