This is a map butterfly video.
Dutch entomologist Marlie Huskens described nature reserve De Meinweg in Limburg province, on last Tuesday, 2 September 2014.
To her surprise, she counted over 250 map butterflies. Most of them feeding on horse and roe deer manure. Others fed on hemp-agrimony flowers. Yet others were resting, or drinking from puddles.
Such big congregations of butterflies are called mud-puddling. It is unusual for the Netherlands.
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