Brown isn’t an unusual color in a butterfly, but green is unusual. This is a Juniper Hairstreak (Callophrys gryneus). It’s a small butterfly with a wingspan of just 3/4 to 1 1/4 inches.
Native to North America. Here in Virginia the larval host plant is Eastern Redcedar (Juniperus virginiana).
This guy in the photo is getting nectar at the flowers of an Applemint (Mentha suaveolens).
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