Anyone know if I should be worried for the sake of my chickens?

Not the greatest of pics unfortunately, taken from living room window. I got outside and into the garden just in time to see it fly off...tch.
Think it may be a young buzzard but could be completely wrong there.
Nice to see such wildlife around but also slightly worrying as, like I say, I have chickens so am now worried they may be in danger of becoming a snack...
