|A male in NW Ecuador|
|A female in NW Ecuador|
The violet-tailed sylph (Aglaiocercus coelestis) is a species of hummingbird. It is found in Colombia and Ecuador. This sylph lives in areas from 300–2,100 metres (980–6,890 ft) in elevation, though typically above 900 metres (3,000 ft) on the west slope of the Andes.
Males average around 7 inches (180 mm) in length, while females average around 3.8 inches (97 mm).
"...a rapid, double-sounding tez-it at 1 per sec for up to several minutes..."
"Solitary and usually low inside forest at small clumps of flowers. Hovers or occasionally clings to feed and does not gather at flowering trees." 
- BirdLife International (2012). "Aglaiocercus coelestis". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- A guide to the Birds of Colombia By Steven L. Hilty, William L. Brown, p.296, Published by Princeton University Press, 1986
- Violet-tailed Sylph photos; Article w/RangeMaps InfoNatura NatureServe
- Violet-tailed Sylph videos on the Internet Bird Collection
- Photo-High Res; Article chandra.as.utexas.edu–"Birds of Ecuador"
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