Lorraine Bennery / Northern blue butterfly (Plebejus idas) and Eros blue butterflies (Polyommatus eros) puddling, Hautes-Alpes, France, July.
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Lorraine Bennery / Blue butterflies, from left to right : Eros blue (Polyommatus eros), Northern Blue (Plebejus idas) and Amanda's blue (Polyommatus amandus) on grass, Hautes-Alpes, France, July.
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Jussi Murtosaari / Idas Blue or Northern Blue (Plebejus idas) male feeding, Lapland, Karigasniemi, Finland, July.
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Jussi Murtosaari / Idas Blue or Northern Blue butterflies (Plebejus idas) copulating, male with unusual black stripe, Lapland, Karigasniemi, Finland, July.
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Kim Taylor / Idas Blue (Plebejus idas) male on Aster flower, Croatia
