That's a hawk alright and I would guess a coopers hawk. They generally leave my standard size hens along but the bantam size are fair game.
My chickens react to the alarm call of the blue jays, once the blue jays start making a racket the hens stand to attention and then it takes one chicken...
Typically with any predator attack you will find feathers. Birds will do what is called a "predator molt", when being attacked feathers loosen and come out easily so that hopefully the predator ends up with a mouth full of feathers and the bird can escape.
Don't rule out human predators either.
No offense Xtremerooster but that is typical gov't, no common sense.
I worked for a company that had gov't housing contracts. We had this one family that was just nasty, dirty, well just plain disgusting. Never cleaned their apartment, dishes with not just a coating of food but full plates of...
I know some have had success with shrubs and man made shelters but my experience is that a hawk whether it be a red tail, coopers, harris etc will eventually come to ground and panic the hens from out of the shelter and then catch one as it runs in panic. I witnessed them doing it. Hawks also...