In standard measurements, long-eared owls vary in wing chord length from in males, with 883 in North America averaging , and in females, with 520 American ones averaging . The tail may measure in males and in females, with 1408 owls averaging . Less widely measured are bill length, which averaged in males and in females from North America, and tarsus length, which averaged in 20 males and for 16 females from Europe, with a range in both sexes of . In terms of their skeletal structure, it bears a relatively wide skull but relatively small eyes and orbits, while the beak is relatively elongated but weak. The legs are relatively long and thin and, while needle-sharp, the talons are relatively fine and the feet relatively weak for an owl. However, the talons are still highly proficient at drawing blood if contact is made with human skin.