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Stripe-tailed Yellow-finch (Sicalis citrina)
Brazil
The Stripe-tailed Yellow-finch is found patchily from Colombia to northern Argentina. Throughout this range it is found locally in grassland and farmland.
The male is olive-brown above with a lemon-yellow forecrown. It is mostly yellow below. The "stripe-tailed" moniker derives from two white spots on the underside of the tail which can be difficult to see but is well illustrated in photos 1 and 3. The female is much duller and streakier.
The rather streaky nature of the bird in the 4th photo suggests to me that it might be a young male.
There are illustrations in Hilty & Brown, Plate 56 and Ridgely & Tudor, Plate 31.
Pretty bird but awfully annoying. Finches are by far one of my least favorite birds. No, I really can't say that. But I really could do without them. Especially when they take on troll-like attributes.