At which angle can an eagles and owls swivel their head?

Best bird night vision – Owls.

Despite their smaller size, owls have eyes almost as big as ours and their huge pupils capture lots of light. In fact, an owl could probably spot a mouse on a football pitch lit by a single candle. Secondly, like other birds, their brains can capture an 'at a glance' picture that a human eye would have to scan back and forth to understand. However because their forward-facing eyes are so big, they can't move them. Which is why, like eagles, they can swivel their heads 270 degrees - allowing them a wide field of vision.