males in Maasai Mara, Kenya averaged . Meanwhile, females can weigh from . In southern Africa, seven females averaging . Elsewhere, a claim was made of an average of almost certainly describes a sample entirely of female specimens. In the Maasai Mara, 7 females averaged . Reports of males weighing as much as and females weighing as little as are known but may possibly represent individual eagles misidentified by sex, which is reportedly not infrequent due to mistakes in the field. Thus the dimorphism by weight is roughly 36% in favor of the female, which is unusually out-of-sync with the linear differences between the sexes. For example, the greater spotted eagle (Clanga clanga), the most sexually dimorphic booted eagle overall with a linear difference between the sexes of 20%, has around the same level of sexual dimorphism by body mass as the martial eagle which show about half as much linear dimorphism. In standard measurements, male martial eagles measure in wing chord size, in tail length and in tarsus length. Meanwhile, females measure in wing chord, in tail length and tarsal length. Overall, the bulk and much more massive proportions of females, which include more robust feet and longer tarsi, may at times allow experienced observers to sex lone birds in the wild. Colouring and field identification The adult's plumage consists of dark brown coloration on the upperparts, head and upper chest, with an occasional slightly lighter edging to these feathers. The dark feathers can appear grayish, blackish or even plum-colored depending on lighting conditions. The body underparts are feathered white with sparse but conspicuous blackish-brown spotting. The underwing coverts are dark brown, with the remiges being pale streaked with black, overall imparting the wings of adults a dark look. The underside of the tail has similar barring as the remiges while the upperside is the same uniform brown as the back and upperwing coverts. The eyes of mature martial eagles are rich yellow, while the cere and large feet pale greenish and the talons black. Martial eagles have a short erectile crest, which is typically neither prominent nor flared (unlike that of the crowned eagle) and generally appears as an angular back to a seemingly flat head. This species often perches in a quite upright position, with its long wings completely covering the tail, causing it be described as “standing” rather than “sitting” on a branch when perched. In