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Antheraea polyphemus
Large Moth/butterfly. Maybe 6 in across. Main color is an orange/brown. Spots on the front wings. Large blue/yellow spots on the hind wings. Comb antennae.
Found this huge moth in the scrub oak mountains to the east of Tooele, Utah. There were some pines growing but mostly gamble oak.
Saw it first at night but it was still there in the morning. It had it's wings up and would shake. Looked sick, dying?