a huge solid black hawk got my old EE roo yesterday , probably was the oldest chicken I have , the pen he was in with 10 other chickens has 'new' 6 ft tall welded wire fence with mason string criss crossing the top he lit on a post top and slid through a hole in the string ,, had a lot of trouble getting out but he / she has came back 2 times ,, just at dawn and at sunset . I have a lot of trees and can't wire the tops and the pens are 25x25 on 3 of them and 50x50 on 1 other would not be pracitacl (sp) to cover them with all the leaves and limbs that fall .
Have seen this hawk 10 or more times but it finally got chicken hungry . , it probably has a wing span of over 4 ft .