Its habitat is subtropical or tropical moist montane forests.  It follows a habitual path or "trap-line" with stops at flowering plants such as Bomarea, Cavendishia, Fuchsia, Macleonia, Mutisia, and Palicouria, whose nectar it feeds on. It also catches insects in flight and gleans them off plants. In general its behavior is probably similar to that of the golden starfrontlet, which may be a subspecies of this species.
It averages 11.4 centimetres (4.5 in) in length, plus its very long bill (3.3 centimetres (1.3 in)), and 6.5 grams (0.23 oz) in weight. The adult male's crown is blackish with a glittery green patch over the bill (a "frontlet"). Its back is golden-green with a greenish-copper rump. A rufous-buff patch on the tertial wing feathers is conspicuous in flight. The breast glitters green, as does the throat except for a small violet patch in the center. The belly, coppery to reddish gold, glitters intensely. The tail is bronze-green and slightly forked.
- IUCN Red List
- Beolen, Bo; Watkins, Michael (2004). Whose Bird? Common Bird Names and the People They Commemorate. Yale University Press. p. 49. ISBN 0-300-10359-X. Retrieved 2007-04-08.
- Hilty, Steven L. (2003). Birds of Venezuela. Princeton University Press. p. 425. ISBN 0-691-09250-8. Retrieved 2007-10-04.
- Stiles, Gary (November 2004). "Split Coeligena eos from Coeligena bonapartei". Archived from the original on 2006-09-04. Retrieved 2007-10-04.
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