About Eupherusa cyanophrys J.S.Rowley & Orr, 1964
The Oaxaca hummingbird, scientifically known as Eupherusa cyanophrys J.S.Rowley & Orr, 1964, measures 10 to 11 cm (3.9 to 4.3 in) in length and weighs 4.1 to 5.4 g (0.14 to 0.19 oz). Both males and females have a straight black bill. Males have a violet-blue forehead, a turquoise crown, and emerald green upperparts. Their rufous secondaries form a visible patch when the wing is folded. The central pair of their tail feathers is green, while the remaining four pairs are whitish. Their underparts are glittering green, with white undertail coverts. Females have green upperparts and a wing patch similar to that of males. The central tail feathers of females are green, and the other tail feathers are white with some dusky green markings. Female underparts are pale gray. This hummingbird species is found exclusively on the Pacific slope of the Sierra Madre del Sur, also known as Sierra de Miahuatlán, in southern Oaxaca. It lives in both the edges and interior of humid montane forest, semi-deciduous forest, and pine-oak forest. Its elevation range spans from 700 to 2,600 m (2,300 to 8,500 ft), and it is most common at elevations below 1,800 m (5,900 ft).
