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Genus Aglaiocercus
Aglaiocercus berlepschi - The male is 22 centimetres in length with the elongated outer tail-feathers accounting for 14-15 centimetres. Its plumage is mostly irridescent green. The throat is blue and the outer tail-feathers are violet, becoming blue towards the tips. The female is 9.5-11 centimetres long. The tail is shorter than that of the male but still fairly long and slightly forked. Females have a blue crown and white throat, breast and belly.
Violet-tailed Sylph - "...a rapid, double-sounding tez-it at 1 per sec for up to several minutes..."
Long-tailed Sylph - Courtship strategy