Family Tanagers (Thraupidae)

Least Concern

Peg-billed Finch (Acanthidops bairdi)


French: Bec-en-cheville gris German: Vulkanammertangare Spanish: Yal costarricense

Acanthidops bairdi


, 1882,

Volcán de Irazú, Costa Rica


Species name often misspelt “bairdii#R. Monotypic.


Highlands of Costa Rica (S from Cordillera Guanacaste) and W Panama (W Chiriquí).

Descriptive notes

13 cm; 16 g. A small finch with peculiar bill shape, very narrow, in profile long and fine, yet thicker-based, looking constricted a third of the way from base, and long and... read more


Song 3–4 rapid-fire high-pitched notes followed by almost electric buzz, “t-t-t-tzééééwww”. Call a... read more


Edges and more open areas of highland forest and cloudforest, particularly if bamboo thickets... read more

Food and feeding

Food primarily arthropods, both insects and spiders (Araneae); also seeds, particularly of bamboo, as well as other grasses (e.g. ... read more


Season Mar–Jun. Nest built by female, a bulky, compact cup of plant material, one consisted mainly of leafy liverworts, moss and very small... read more


Resident; moves locally to take advantage of periodic seeding of bamboo.

Status and conservation

Not globally threatened. Restricted-range species: present in Costa Rica and Panama Highlands EBA. Generally uncommon to rare throughout its range; becomes locally common... read more

Recommended citation

Jaramillo, A. (2020). Peg-billed Finch (Acanthidops bairdi). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 21 February 2020).