Yellow-billed Tit-Tyrant Anairetes flavirostris
Version: 2.0 — Published July 9, 2020
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Surprisingly little information, for such a widespread and common species; most of what is reported is from Argentina.
In Bolivia, fledglings are reported from Chuquisaca in February, and juveniles from Potosí in February (2). Breeding in Argentina generally is from October to January, including records of active nests (nests containing eggs or nestlings) in November and December (22, 23); a specimen with an egg in the oviduct reported from October; and specimens with enlarged gonads collected in January-February.
Nest dimensions are external diameter 6.5-7 cm; external height 7-8 cm; internal diameter 3-4 cm; and cup depth 3-3.5 cm (n = 2; 22).
Structure and Composition
Color and Surface Texture
Eggs white (22).
Clutch 2–3 eggs (22).
The incubation period at one nest was at least 13 days (23).
Nestling period not documented.