* Size: Male spotted owls are typically larger than females. The average length of a male spotted owl is 18-20 inches, while the average length of a female spotted owl is 16-18 inches.
* Weight: Male spotted owls also weigh more than females. The average weight of a male spotted owl is 1.2-1.6 pounds, while the average weight of a female spotted owl is 1.0-1.4 pounds.
* Head shape: Male spotted owls have a more rounded head shape than females. Females have a more pointed head shape.
* Eyes: The eyes of male spotted owls are typically a darker brown than the eyes of female spotted owls. Females' eyes are usually a lighter brown or amber color.
* Voice: Male spotted owls have a deeper, more resonant voice than females. Females have a higher-pitched, more piercing voice.
In addition to these physical differences, male and female spotted owls also differ in their behavior. Males are typically more territorial than females, and they will defend their territory from other males. Females are more likely to move around in search of food and nesting sites.