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Includes Mistletoe Tyrannulet, Venezuelan Tyrannulet
9.5 cm long and weighs 8.5 g. Olive-green upperparts, grey crown and supercilia, black wings with yellow feather edging, long dark tail, off white grey streaked throat and breast, white belly, yellow-green flanks, black long legs. Sexes similar.
Five subspecies are recognized:
Gill and Donsker (2010) recognise Venezuelan Tyrannulet Zimmerius improbus as a separate species (includes Z. i. improbus, Z. i. tamae, Z. i. petersi).
Humid forests, second growth, plantations, pasture with trees and shady gardens.
It builds a spherical nest made of mosses, lined with plant firbre, with a side entrance. Typically 2 rufous-marked dull white eggs are laid. Female incubates for 14 days and after 17 days the young fledge.
It is usually seen alone or in pairs high in trees.
The diet is mainly mistletoe, but also other berries and small insects, all taken in flight.
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