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…a species of sphinx moth that is native to Mexico, Central America and parts of South America. The adults of this species are fairly normal as far as sphinx moths go, but their larvae are extraordinary. H.triptolemus larvae are snake mimics and fairly good ones at that, as their ‘butts’ have been modified to look like a snake complete with eyes and all. They are also able to expand their anterior segments to make ‘the head’ appear larger, and they will even strike (harmlessly) at potential predators to keep the mimic going.
H.triptolemus larvae are usually found feeding on M.trifida and adults will fly twice per year once from January to February and again from June to July. Source