The upper edge of the lower bill and the lower edge of the upper bill taper to a sharp edge, and overlap in a scissor-like fashion, enabling it to cut through the tissue of the prey. The bill is curved downwards in order to keep the owl's field of vision clear. The nostrils are positioned towards the base of the beak, in a region called the cere. Most Owls have a very poor sense of smell. Face of a Barn Owl showing downward curved bill. Photo Â© Mike Atkinson. Boobook Owl face showing the nostrils located on the cere. Photo Â© Deane Lewis. Heavy bill of a Powerful Owl.