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What is the smallest butterfly?

Here is the smallest butterfly in the world. I saw it last spring at the Burnt Lands Alvar Provincial Park. The strawberry flower it is sitting on is pretty close to the size of a dime. All of the butterflies in the family Lycaenidae (Blues, Coppers and Hairstreaks) are pretty small. The smallest on record is the Western Pygmy Blue. – Dr. Naomi Cappuccino

Western Pygmy Blue, native to the western U.S. has a wingspan of 12-20mm