Females are typically larger and more rufescent than the males.
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Females are very similar to those of Cotana meeki, but are paler and more rufescent on the wings, while the postdiscal white bands are much narrower.
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In Kenya and Uganda, the subspecies is sometimes known as the Elgon francolin. Compared to the nominate subspecies of Ethiopia, the Elgon francolin is brighter (more rufescent) and lacks black spots to the throat, leading to conflicting taxonomic treatments.McGowan, P. J. K. (1994). Moorland Francolin (Francolinus elgonensis).
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41: 65–74 Until 2009, it was usually included as a subspecies of the western mountain coati, but the eastern mountain coati is overall smaller, somewhat shorter-tailed on average, has markedly smaller teeth, a paler olive-brown pelage, and usually a dark mid-dorsal stripe on the back (versus more rufescent or blackish, and usually without a dark mid-dorsal stripe in the western mountain coati). When the two were combined, they were rated as Data Deficient by the IUCN, but following the split the eastern mountain coati is considered endangered.
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The chestnut-breasted partridge (Arborophila mandellii) is a species of partridge endemic to the eastern Himalayas north of the Brahmaputra, and is known from Bhutan, West Bengal (Darjeeling only), Sikkim and Arunachal Pradesh, north-east India, Nepal Himalaya and south-east Tibet. It is a distinctive partridge with chestnut breast-band and grey belly. It is distinguished from the similar rufous-throated partridge A. rufogularis by more rufescent crown and head-sides, white gorget and entirely chestnut upper breast. The scientific name commemorates the Italian naturalist Louis Mandelli.
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Until 2009, the western mountain coati (then simply known as the mountain coati) usually included the eastern mountain coati as a subspecies, but that species is overall smaller, somewhat shorter-tailed on average, has markedly smaller teeth, a paler olive-brown pelage, and usually a dark mid-dorsal stripe on the back (versus more rufescent or blackish, and usually without a dark mid-dorsal stripe in the western mountain coati). When the two were combined, they were rated as Data Deficient by the IUCN, but following the split the western mountain coati is considered Near Threatened. There are two subspecies of the western mountain coati: N. o. olivacea and the slightly smaller and darker N. o.
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Externally, the two species of mountain coatis are quite similar, but the eastern mountain coati is overall smaller, somewhat shorter-tailed on average, has markedly smaller teeth, a paler olive- brown pelage, and usually a dark mid-dorsal stripe on the back (versus more rufescent or blackish, and usually without a dark mid-dorsal stripe in the western mountain coati). Both are found in cloud forest and páramo; at altitudes of for the eastern mountain coati, and for the western mountain coati. A population discovered in southern Peru (more than south of the previous distribution limit) has tentatively been identified as the western mountain coati, but may represent an undescribed taxon.Pacheco, V., R. Cadenillas, E. Salas, C. Tello, and H. Zeballos (2009).
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