The Coppery-headed EmeraldElvira cupreiceps, is a small hummingbird endemic to Costa Rica. IT is 7.6 cm in length, and weighs only 3 g. The male has distinctive coppery crown and rump with a whole green belly and white vent. The female has a white belly and a narrow black subterminal band on white outer rectrices of the tail. Its noticeably decurved bill sets it apart from the White-tailed Emerald.