Bunches of butterflies

Source: Bunches of butterflies

These aggregations of puddling butterflies usually consist largely of males, which are thought to be replenishing their sodium-reserves, lost (or soon to be lost) in the process of delivering a spermatophore to females during mating. Or more prosaically, it may be to enable the males to produce a ‘nuptial gift’ in the form of sodium, for the females.

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