The yellow-billed teal (Anas flavirostris) is a South American species of duck.

[2][3][4] It occurs in Argentina, the Falkland Islands, Chile, Peru, Bolivia, Uruguay, and Brazil.

[6] The species is somewhat similar to the larger yellow-billed pintail, but has a darker head, shorter neck and plain grayish sides.

[7] Mitochondrial DNA sequence data is most similar to that of the very different-looking green-winged teal.

[2] This species is also unique among its relatives in some aspects of its post-copulation behavior: After dismounting, the drakes stretch themselves up high and swim around and alongside the females.