YELLOW-BILLED TEAL 
ANAS FLAVIROSTRIS Vieillot 
(Plate 37) 
Synonymy 
Anas flavirostris Vieillot, Nouveau Dictionnaire d’Hist. Nat., vol. 5, p. 107, 1816. 
Anas creccoides King, Zool. Journ., vol. 4, p. 99, 1828. 
Querquedula creccoides Eyton, Monograph Anatidse, p. 128, 1838. 
Anas azarce Merrem in Ersch and Grube’s Encyclop., sect. 1, vol. 35, p. 26, 1841. 
Querquedula oxyptera Hartlaub {nec Meyen), Naumannia, 1853, p. 217. 
Querquedula flavirostris P. L. Sclater, Proc. Zool. Soc. London, 1867, p. 335 (part). 
N ettion flavirostris G. R. Gray, Hand-list Birds, vol. 3, p. 83, 1871. 
Nettion flavirostre Salvador!, Cat. Birds British Mus., vol. 27, p. 261, 1895. 
Vernacular Names 
English: Yellow-billed Teal, Chilian Teal, Tree Teal. 
German: Chilenische Krickente. 
Spanish: Pato chico, Pato jergon chico, Patito, Pato barcino chico, Assobiadeira. 
DESCRIPTION 
Adult Male : Head and neck gray, thickly and finely barred with black. Mantle gray. Scapulars 
with black centers and light edges. Back, rump, upper tail-coverts and tail, gray-brown. Lower 
parts silvery white to light gray, the feathers having round black spots on the breast and upper 
abdomen, and indistinct black bars and spots on the lower abdomen. Under tail-coverts brownish 
to gray. Outer wing-coverts uniform gray except the greater ones which have a band of cinnamon on 
their tips. Speculum velvety black except the inner edge, which is metallic green. There is a broad 
buflFy band at the tip of the secondaries, forming a posterior speculum-band. Primaries dark gray. 
Tertials like the primaries. Under wing-coverts gray and white, axillars white. 
Iris brown. Bill yellow with a black nail. Feet grayish. 
Wing 192-202 mm. ; bill 35 ; tarsus 37. 
Adult Female; Like the male, but the round spots on the breast are not so prominent, and the 
tertials are not so black in their centers. Size smaller; bill not so bright colored. 
Wing 185-197 mm.; bill 30-35; tarsus 35. 
Young in First (Juvenal) Plumage : The pileum is blacker, and the lower parts, especially the 
breast, are not so distinctly spotted. There is less of the silvery sheen to the lower surface. The whole 
upper surface is inclined to be darker and browner, with light edgings of the feathers brown, rather 
than gray. 
Young with some down still adherent and primaries not yet started are very like the last but lower 
parts almost unspotted except on upper breast. 
