Green Hylia Hylia prasina Scientific name definitions

12 cm; 10–16.5 g. A stocky medium-sized warbler. Plumage is dark olive-green above, darkest on top of head, with prominent long, pale yellow supercilium, broad blackish stripe through lores and behind eye; cheek olive-yellow; tail, upperwing-coverts and edges of flight-feathers olive-green; chin and throat whitish, underparts olive-gray; iris dark brown; bill blackish; legs olive-brown to olive-green. Sexes alike. Juvenile has top and side of head dark olive-gray, supercilium and throat washed pale gray, underparts darker than in adult; bill and legs yellow. Subspecies poorly differentiated; poensis has throat purer white than nominate.

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Editor's Note: Additional distribution information for this taxon can be found in the 'Subspecies' article above. In the future we will develop a range-wide distribution article.

Undergrowth of primary and secondary lowland and montane forest, gallery forest, forest-grassland mosaic, relict forest patches, plantations and moist secondary bush; also thick tangles on edges and clearings in forest and along sides of tracks. At 700–1800 m in East Africa; to 2100 m in Cameroon.

Loud, penetrating double or sometimes treble whistle, “tyee tyee”, “tew tew” or “tee tee yeu”, given at irregular intervals. Alarm a rapid dry chatter, “chichichichichit”; brief purring contact call.

Breeds in Mar–Apr, Jul and Sept in Cameroon, Nov–Apr in Gabon, Sept–Oct in Republic of Congo, Jan in Sudan; in DRCongo Oct–Jun (mainly Jan–Feb) in Itombwe, probably through rains in Ituri; Jun in Kenya. Nest a large domed oval structure with sideways entrance at top, built loosely of dry leaves and twigs, with middle layer of fibers, lined with plant down, placed 0.4–1.3 m up in fork in bush or on low branch of small tree. Clutch usually 1 egg; no information on incubation and nestling periods.