Green-headed Hillstar (Oreotrochilus stolzmanni) [XC414298]
by Niels Krabbe from Loja: Chuquiraga patch above Jimbura, Ecuador (call)
Green-headed Hillstar (Oreotrochilus stolzmanni) [XC36394]
by Niels Krabbe from Lagunillas 39 km W of Zumba, Loja, Ecuador (call)
Subspecies
Forms a superspecies with Andean Hillstar (Oreotrochilus estella), Ecuadorian Hillstar (Oreotrochilus chimborazo) and White-sided Hillstar (Oreotrochilus leucopleurus), and all have been considered conspecific, but separated largely on morphological grounds. Frequently lumped into Andean Hillstar (Oreotrochilus estella).
Considered by some authors to be a subspecies of Andean Hillstar (Oreotrochilus estella).