Blues and Browns

I found lots of blue butterflies and also brown ones.
Mostly sunbathing in the early morning
To find out which is who and who is which, you have to look at the dots.

Polyommatrus Icarus, Common Blue, Icarus Blauwtje.
Aricia Agestis, Brown Argus, Bruin Blauwtje
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I found a photo on the web of Stefan Hermans,
who made a clear explanation to find out about the difference.