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Caligo uranus
An owl butterfly is a butterfly, in the genus Caligo, known for their huge eyespots, which resemble owls' eyes. They are found in the rainforests and secondary forests of Mexico, Central, and South America. Owl butterflies are very large, 65–200 mm (2.6–7.9 in), and fly only a few metres at a time, so avian predators, and we avid photographers! have little difficulty in following them to their settling place. However, the butterflies preferentially fly in dusk, when few avian predators are around.
Should be Caligo uranus, almost identical to Caligo atreus dionysos, but that one is probably not found in Guatemala.
http://www.flickr.com/photos/camerar/111...