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Melanargia galathea is a butterfly in the family Nymphalidae. It is found in forest clearings and edges, meadows and steppe across most of Europe, southern Russia, Asia Minor and Iran.
Like other members of its subfamily, the larvae feed on various grasses. Eggs are laid on the wing, or from brief perches on grass stems, and are just sprinkled among the grass stems. Upon hatching, the larvae immediately enter hibernation and only feed the following spring when the fresh growth occurs. They are a lime-green colour, with a dark green line running down the middle of their back. Pupation takes place at ground level in a loose cocoon. Adults emerge in July, and, on a good site, in warm, sunny weather, thousands can be seen gently fluttering amongst the grass heads. (source: Wikipedia)