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Saffron-billed sparrow
	In Piraju, São Paulo, Brazil
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Passeriformes
Family:	Passerellidae
Genus:	Arremon
Species:	A. flavirostris
Binomial name
	Arremon flavirostris; Swainson, 1838

The saffron-billed sparrow (Arremon flavirostris) is a species of bird in the family Passerellidae, the New World sparrows. It is found in Argentina, Bolivia, Brazil, and Paraguay.^[2]

Taxonomy and systematics

The saffron-billed sparrow has two subspecies, the nominate Arremon flavirostris flavirostris and the "gray-backed" A. f. polionotus.^[3] In January 2021, both the South American Classification Committee (SACC) of the American Ornithological Society (AOS) and the International Ornithological Congress (IOC) elevated the former subspecies A. f. dorbignii to species status as the moss-backed sparrow.^[4]^[2]

Description

The saffron-billed sparrow's name comes from its "striking orange bill". The adult male's head is mostly black, with a white supercilium from above the eye to the back of the head. The neck is gray and the back, wings, and tail are green. Its underside is white with grayish edges and a narrow black band across the upper chest. The adult female is similar but duller overall. The female's underparts are buffy with brown flanks. Juveniles are similar to the adults but duller. The species' length is from 15 to 16.5 cm (5.9 to 6.5 in). The mean weights of 27 specimens from three populations were from 23.6 to 28.1 g (0.83 to 0.99 oz).^[3]

Distribution and habitat

The nominate subspecies of saffron-billed sparrow is found in central and eastern Brazil. The "gray-backed" subspecies is found further south, in central and southern Brazil, eastern Bolivia, much of Paraguay, and northeastern Argentina.^[2]^[3]

The saffron-billed sparrow primarily inhabits tropical deciduous forest, both primary and second-growth. It is often found near forest edges, interior openings, and along waterways. In elevation it ranges from sea level to 1,400 m (4,600 ft).^[3]^[1]

Behavior

Feeding

Though the saffron-billed sparrow's diet is not well known, it does include fruit, grain, and insects.^[3]

Vocalization

The song of the saffron-billed sparrow is a series of rapid notes variously described as "tsit, tsee-tsi-tsi, tseép-seép-tseép" and "sidsidlidsidlsidli". Its call is an insect-like "tseet". It vocalizes on or near the ground.^[3]

Status

The IUCN has assessed the saffron-billed sparrow as of Least Concern. Though the species' population has not been determined, it is believed to the stable. It inhabits a very large range and appears to tolerate forest fragmentation.^[1]^[3]

References

^ ^a ^b ^c BirdLife International (2019). "Arremon flavirostris". IUCN Red List of Threatened Species. 2019: e.T155185342A155636080. doi:10.2305/IUCN.UK.2019-3.RLTS.T155185342A155636080.en. Retrieved 15 November 2021.
^ ^a ^b ^c Gill, F.; Donsker, D.; Rasmussen, P. (January 2021). "IOC World Bird List (v 11.1)". Retrieved January 14, 2021.
^ ^a ^b ^c ^d ^e ^f ^g Gunningham, H. R. and D. L. Slager (2020). Saffron-billed Sparrow (Arremon flavirostris), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.sabspa1.01 retrieved April 25, 2021
^ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 19 January 2021. A classification of the bird species of South America. American Ornithological Society. http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved January 19, 2021