Owls cannot move their eyes, so they rotate their heads to look around.

The longer version

Owl eyes are large, tubular and fixed in place by a ring of bone, a shape that gathers maximum light for night hunting but sacrifices the ability to swivel within the socket. The trade-off is compensated for by an extraordinarily flexible neck.

Owls have more neck vertebrae than most birds, and their arteries run through bony channels that protect them during extreme twisting. Extra spaces in the vessels allow blood to pool, so circulation continues even when the head turns far around. Combined with forward-facing eyes and a facial disc that funnels sound to the ears, this lets a perched bird track prey without moving its body and giving itself away.

Where this entry sits

This collection gathers small surprises about mammals, reptiles, amphibians, birds, fish, insects, and the pets living alongside people. Expect odd details about senses, anatomy, and everyday behaviour that many people never notice in the animals around them. The full list sits on the Animals page, where every entry is listed in order.