Yellow-green Tyrannulet Phylloscartes flavovirens

Yellow-green Tyrannulet is confined to a tiny range that lies entirely within eastern Panama, from the Canal Zone to the Darién. This species is expected to occur as well in adjacent Colombia, but has yet to be reported from there. This small tyrant flycatcher is most easily distinguished by its white eyering, two yellowish wing bars, its nearly uniform yellow underparts, slender build with a long tail, and horizontal posture. It is mainly recorded between 900 and 2000 m, principally on the Pacific slope of the country. Yellow-green Tyrannulet is uncommon to fairly common, but almost nothing has been published concerning its behavior and ecology. This species is mainly found in the forest canopy, and like other species of Phylloscartes, Yellow-green Tyrannulet is most frequently seen within mixed species foraging flocks.