Great Horned Owl

Female great horned owls are larger than males and weight about 50% more.

The sex difference in great horned owls is best known. Females are much larger than males, yet they possess smaller syringes. Males measure from 18-23 inches, with females much larger at 22-25 inches. Females weigh about 50% more than males with males weighing about 3-3.8 pounds and females weighing up to 4.8 pounds. Contrarily, the syringes of females average 17% smaller than those of males.

Sources: (Forbush, 1929; Kinstler, 2009; Miller, 1934)
Image: Greg Lasley


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