Map butterfly on Dutch islands, new discovery

This video from the Netherlands is about map butterflies (their early summer morph).

Recently, map butterflies were recorded for the first time on Ameland and Vlieland islands in the Dutch Wadden Sea.

Probably, south winds blew them to these most northern places where this species was ever seen in the Netherlands.

Since about 1950, map butterflies spread over the Netherlands from the south.

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