Troublesome Birds - Buenos Aires (1 Viewer)

Grey-crowned Tyrannulet - Grey-capped?

D

I am pretty sure common gallinule will be common moorhen.

Likewise, I am pretty sure that SA Painted Snipe is the same as Am Painted Snipe.

The others I cannot answer off the top of my head, maybe with some more searching

Niels

A little more:

Sulphur-throated Spinetail - Sulphur-bearded? seems right according to the Internet Bird Collection, which uses Sulphur-Throated for Cranioleuca sulphurifera which in Opus is Sulphur-bearded Spinetail.

Grey-crowned Tyrannulet - Avibase has this as a "doubtful taxon", but does not say that it is subspecies of something else either, so I honestly don't know.

Bonaparte's Blackbird - White-browed Blackbird? This seems correct, as Avibase mentions that this species was described by Bonaparte and that Bonaparte's Blackbird is another English name ...

Golden-breasted Flicker - This seems to be subspecies melanolaimus of Colaptes melanochloros AKA Green-barred Woodpecker. This subspecies seems to be sometimes split into Colaptes melanolaimus (or melanolaema) AKA Golden-breasted Woodpecker which however is not in Opus (only recognized by Clements at this point, it seems). A redirect therefore probably at this point should go to Green-barred W.

Rufous-thighed Goshawk -- Search for only the first two words give three results, an accipiter, a buteo, and a kite. The accipiter is most likely based on Goshawk, and the map includes Argentina, so that would be my guess: Rufous-thighed Hawk (Accipiter erythronemius)

Bare-faced Ibis - Buenos Aires: Whispering Ibis (Phimosus infuscatus) according to Clements and other authorities. Avibase has Bare-faced Ibis as alternative name for Sharp-tailed ibis, but not used as such by any authorities, and the map does not show sharptailed south of Brazil.

Argentine Ruddy Duck : according to Avibase, Lake Duck has a whole slew of synonymes: Argentine Blue-bill, Argentine Blue-billed Duck, Argentine Lake Duck, Argentine Ruddy Duck, Lake Duck

Cheers
Niels

Edit: Golden-breasted Woodpecker appeared in 4th and 5th edition of Clements but not in 6th edition ...

Yup... Golden-breasted Woodpecker [Colaptes (melanochloros) melanolaimus] is a subspecies of Green-barred Woodpecker (Colaptes melanochloros), sometimes considered separate species.

Thanks both...

I have edited my post to leave just the Tyrannulet... hopefully one day someone will be able to track it down.

D