Grayling; Sátiro común

Big Nymphalidae butterfly with wonderful camouflage that melted perfectly with the bark of the tree. It rests with closed wings, forewings lowered between the hindwings as do many Satyrinae. When I disturbed it, the butterfly raised its forewings for a second or so, revealing dark eye spots and then flew away.
This butterfly has a curious technique for regulating body temperature by leaning its wings at different angles to the sun. The larvae feed on various types of gramineae.