Family Finches (Fringillidae)

Least Concern

Thick-billed Siskin (Spinus crassirostris)


French: Tarin à bec épais German: Dickschnabelzeisig Spanish: Jilguero piquigrueso

Chrysomitris crassirostris


, 1877,

near passes of Uspallata and Portillo, Mendoza, Argentina


Races possibly intergrade, although birds from WC Peru (Ancash to Ayacucho), postulated in HBW to represent intermediates, being similar to nominate but with smaller base to lower mandible and breast tinged olive as in race amadoni, also have been suggested to represent an undescribed race#R. Two subspecies recognized.

Subspecies and Distribution
  • S. c. amadoni George, 1964 – Andes of C to SE Peru, extreme N Chile and NW Bolivia.
  • S. c. crassirostris (Landbeck, 1877) – S Bolivia, NW Argentina and C Chile.
  • Descriptive notes

    12·5–14 cm; 19 g. Medium-sized, greenish-yellow finch with large bill, bright yellow wing-flashes and notched tail. Male nominate race has head to upper nape,... read more


    Song a series of twitters typical of siskins, but lower-pitched and with more rapid delivery;... read more


    Montane Andean steppes, in Polylepis shrubs and scattered woodland, usually in short or... read more

    Food and feeding

    Almost entirely Polylepis seeds, buds and shoots in breeding season; less well known in non-breeding season (when apparently... read more


    Birds in breeding condition and nest-building in Mar and eggs in late Feb. No further information.


    Resident, nomadic and partial migrant. Most movements not well known; some of nominate race move N... read more

    Status and conservation

    Not globally threatened. A poorly known species. Locally common to rare; infrequently recorded.

    Recommended citation

    Clement, P. (2020). Thick-billed Siskin (Spinus crassirostris). 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 29 February 2020).