Yellow-billed Tit-Tyrant Anairetes flavirostris

John W. Fitzpatrick, Andrew J. Spencer, and Kyra Leonardi
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 Site

Site Characteristics

Nest is placed in a shrub, 0.7-1 cm above the ground (n = 7; 24, 22, 23).



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

The nest is a neat, shallow cup made of plant fibers, thistle down, and lichens, lined with feathers (24, 22).



Egg dimensions are mean 16.0 x 11. 8 mm (n = 4, range 15.1-16.5 x 11.2-12.2 mm; 24, 22); and 15.2 ± 01 x 11.0 ± 0.1 mm (n = 5; 23).

Color and Surface Texture

Eggs white (22).

Clutch Size

Clutch 2–3 eggs (22).


Little information.

Incubation Period

The incubation period at one nest was at least 13 days (23).

Young Birds

Nestling period not documented.

Recommended Citation

Fitzpatrick, J. W., A. J. Spencer, and K. Leonardi (2020). Yellow-billed Tit-Tyrant (Anairetes flavirostris), version 2.0. In Birds of the World (S. M. Billerman, B. K. Keeney, and T. S. Schulenberg, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.ybttyr1.02