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I'm not entirely certain of their distribution at elevation, but you could be looking at Juniper Hairstreak or Western Green Hairstreak. Here's the full suite of CO species: https://www.inaturalist.org/observations?place_id=34&quality_grade=research&subview=map&taxon_id=58554&verifiable=any&view=species

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I'll guess they are Juniper Hairsteaks as I live in Juniper Pinyon habitat. I see them in the springtime. Thank you for the link!

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Oh, yeah -- and Juniper Hairstreak is the most widespread in North America. Yep, they fly in spring. Something to look forward to!

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I'll wish them well for the winter ahead. I saw a Weidemeyer's Admiral (I had to look it up) fly by. Poof, it was here and gone!

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