I have read on this forum where crows would attack chickens but I just couldn't believe it...in my 60 years being on a farm I have never seen it... Yesterday afternoon I heard our dogs barking and the chickens, ducks and guineas were making a lot of noise. I jumped on the 4-wheeler and rode down to chicken run and saw about 30 to 50 crows swooping down on the chickens...they had already killed 2 in less than 30 seconds and were attacking one more.. It looked like something out Alfred Hitchcock's "The Birds" movie. The crows were up in nearby trees and about 3 to 6 of them would take turns dive bombing the chickens... I shot several times with the shot-gun to scare them off.... Also I had to scare off another flock this morning... We have a lot of crows around here all the time but they have never attacked before.... it may be the unusual cold weather we are having that has them crazy...... Now I am believer, crows will attack and kill chickens.