The Rufous Hornero is Argentina's national bird! They are mostly known for their oven-shaped nests, that one can observe even on hydro poles and other man-made structures!
I didn't post this before as I felt that it was unattractive sitting on rags.
As I look at it again,I am thinking that perhaps it is sitting on eggs.
Taken March 10,2008
Ribera Norte Reserve,
Argentina