The female is larger than the male with an average size of  compared to the male's . The wingspan is . Since the  tail comprises about 56% of this raptor's total length, this species ties with the long-tailed hawk as the raptor with the longest tail relative to its body size.
The female is larger than the male, measuring on average compared to the male's . The wingspan is .  The tail makes up about 56% of the raptor's total length, tying it with the long-tailed hawk as the species with the longest tail relative to its body size.