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Caligo sp.
This specimen had around 15 cm of wingspan. It was difficult to photograph it because of the position it was at.
Thank you, Bayucca and Ashish. When I took off, I briefly saw some blue on its wings, and that made me think at Morpho.
I think Bayucca is correct...
http://www.argentinean-insects.com/morph...
http://en.wikipedia.org/wiki/Caligo
Sergio, this is a Caligo sp., not Morpho. I try to get closer, but it is quite a tricky group.