The Green-crowned Woodnymph (Thalurania fannyi) is a species of hummingbird in the Trochilidae family. It is found in humid forest and tall second growth from eastern Panama, south through western Colombia (incl. Cauca Valley) and Ecuador, to far north-western Peru. It includes the taxon hypochlora from south-western Ecuador and adjacent Peru as a subspecies, but it has sometimes been considered a separate species, the Emerald-bellied Woodnymph (Thalurania hypochlora).

Males have a green head and back, and a violet-blue "shoulder", forked tail and belly (underparts entirely green in males of the taxon hypochlora). Females have a green upperparts, blue or green "shoulder", a white-tipped dark blue tail, whitish throat, chest and vent, and dark grey to green belly (underparts entirely whitish in females of the taxon hypochlora).

Source

• BirdLife International 2004. Thalurania fannyi. 2006 IUCN Red List of Threatened Species. Downloaded on 10 July 2007.
• Stiles, G. 2004. Recognize Thalurania hypochlora as a species distinct from T. colombica (or fannyi). South American Classification Committee.

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