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Large caterpillar , about 10 cm long.
Rainforest
Well, after doing some more searching I think it might be Eumorpha triangulum, based on these sites: http://www.biodiversidadvirtual.org/inse...
http://www.silkmoths.bizland.com/etriang...
You can see my spotting at http://www.projectnoah.org/spottings/634...
I recently found one of these giants feeding on a vine (Cissus verticillata) and haven't been able to narrow it down to which species, but I pretty sure it's a Hawk Moth caterpillar (Eumorpha sp.) Maybe someone out there can narrow it down. I was thinking maybe E. satellitia, but it seems there are a few species with similar looking larvae.