Description wikipedia

The white-tailed goldenthroat (Polytmus guainumbi) is a species of hummingbird in the subfamily Polytminae, the mangoes. It is found in Argentina, Bolivia, Brazil, Colombia, French Guiana, Guyana, Paraguay, Peru, Suriname, Trinidad and Tobago, and Venezuela. The white-tailed goldenthroat is 9.7 to 11.8 cm (3.8 to 4.6 in) long and weighs 4.4 to 5 g (0.16 to 0.18 oz). All subspecies have a long decurved reddish and black bill. The male of the nominate subspecies has shiny golden to bronzy green upperparts. Its tail is long and rounded; the feathers are mostly green with white tips and the outer three pairs have broad white edges. The area around the eye is dusky gray with white streaks above and below it. The underparts are iridescent golden-green. The female has buffy streaks on the face, a whitish chin, and buff underparts with green spots on the throat and breast. P. g. andinus is like the nominate but with more white on the inner tail feathers. P. g. thaumantias has a somewhat shorter bill than the nominate, its upperparts are reddish gold, and it has less white on the outer tail feathers.