The Black-Thighed Puffleg, ÉRione De Derby, Calzadito Patinegro, or Zamarrito Muslinegro (Eriocnemis derbyi) is a species of hummingbird in the Trochilidae family. It is found in Colombia and Ecuador. Its natural habitats are subtropical or tropical moist montanes and heavily degraded former forest. It is threatened by habitat loss.
- BirdLife International 2004. Eriocnemis derbyi. 2006 IUCN Red List of Threatened Species. Downloaded on 10 July 2007.
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