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Automeris io
The Bullseye Moth is sexually dimorphic, meaning that males look different from females. The males have bright yellow wings, body, and legs, but the females aren't as bright, with reddish brown wings, body, and legs.This one was a female, because males also have feathery antennae for detecting the female's pheromones. I photographed it against a white cloth. It had a 3" wingspread when outstretched.
This moth was hit by a car, but was pretty much undamaged (except for being dead). It was found in a moist forest, in the mountains of the Osa Peninsula. Ios are found in Costa Rica, although most of the internet references don't mention that.
This site: http://entnemdept.ufl.edu/creatures/misc... has some terrific photos of all stages of the io, from egg to adult.
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