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Subfamily Theclinae - Hairstreaks

Hoary Elfin - Callophrys polios Frosted Elfin on wild indigo - Callophrys irus Western Pine Elfin - Callophrys eryphon appears to resemble blues? - Callophrys mossii Unknown Butterfly - Callophrys niphon butterfly - Strymon melinus Striped Hairstreak? - Satyrium liparops Western Pine Elfin - Callophrys eryphon
Show images of: caterpillars · adults · both
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Papilionoidea (Butterflies and Skippers)
Family Lycaenidae (Blues, Coppers, Hairstreaks, Harvesters)
Subfamily Theclinae (Hairstreaks)
Synonyms and other taxonomic changes
Often considered as a tribe - "Theclini" under a broader concept of subfamily Lycaeninae, which also incudes Blues and Hairstreaks, and others, as just tribes.
Remarks
The most notable feature of hairstreaks is the tails on the hindwings. Combined with bright spots that look like eyes, they give the illusion that the back end of the wings is really the head. This fools birds and other visually-oriented predators often enough to increase the hairstreaks' odds for survival.

Here's an example- both are the same species in the same area within a few days of each other:
You can see the fake eyes and antennae on this one:

And this one has survived an attack- it's missing a chunk of its wings, but it's still alive and flying around: