Why do owls turn their heads so far instead of just moving their eyes?

Answer: Their eyes are fixed in their sockets

Hollow skull reduces friction — Wrong. Owl skulls aren't hollow—they have solid bone structure. The extreme rotation is enabled by 14 neck vertebrae (twice what humans have), unique blood vessel routing, and special bone pockets that prevent blood vessel damage during rotation.

Their eyes are fixed in their sockets ✓ — Correct! Owl eyes are tubular and held nearly fixed in their sockets, so owls can't shift their gaze the way humans do. To look around, they rely on head rotation up to about 270 degrees, supported by extra neck vertebrae and blood vessel adaptations that help prevent injury.

Special cartilage cushions the turn — Wrong. While owls do have flexible necks, special cartilage isn't the key feature. The rotation is possible because owls have 14 vertebrae (twice the human count) plus specially routed blood vessels that don't get pinched during extreme turns.