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Chalk-browed Mockingbird (38)
PeterZ Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5136 W: 166 N: 13121] (49139)
In the neighborhood of the Iguazu Waterfalls on the Argentina side I saw this bird. It stays most of the time on the ground.

The Chalk-browed Mockingbird (Mimus saturninus) is a bird found in most of Brazil, and parts of Bolivia, Uruguay, Paraguay, Argentina, and Suriname.
It has a large range (around 7,200,000 km˛), and although its population has not been thoroughly surveyed, it is believed to be large as it is reported as "common" in parts of its range. It has been classified as Least concern by the IUCN.

26 cm. Brownish above, conspicuous white eyebrow. More white on the tail than Tropical Mockingbird.

Voice: An excellent singer. A high, sharp (diagnostic) tschrip or tschic. It can also imitate the voice of other birds. (‘mimus’ means: that it imitates).

The Chalk-browed Mockingbird remains long time on the ground observing, while it balances his tail, moves with short runs in search of insects, worms and other small invertebrates that form their main food. Suddenly lifts both wings while walking on the ground.

Any (semi) open environment.

They have their own territory. The nest is a structure opened, deep, build of small branches, roots, in trees or shrubs.
The colour of the eggs is creamy with brown spots measure 28 x 20 mm.

Altered Image #1

PeterZ Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5136 W: 166 N: 13121] (49139)
Sharpening, noise, lighting
Edited by:pekkavalo1 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 423 W: 54 N: 2120] (6789)

Your picture was already perfect. I noticed that you had already cropped it to limit (100%) and tried whether I could get the details slightly more clean. I tried in Photoshop CS3 Focus Magic plug in for focus blur and Neat Image for noise and then adjusted highlights/shadows in CS3. Not a big distinction but I think I managed to get the picture even better.
Thanks, Pekka