Stanley N. Wiemeyer D.G. Smith 1992 Seven morphometric characteristics and weight of males and females of a captive colony of Eastern Screech-Owls (Otus asio) were compared. Females were significantly larger than males in weight, total length, and length of tail, wing and bill. A discriminant function analysis based on weight, wing and tail length correctly identified the sex of 88% of the 77 birds. application/pdf en Determining sex of eastern screech-owls using discriminant function analysis article