Painted Lady
I saw one Painted Lady butterfly in the garden yesterday. These are really interesting migrants. Painted Ladies hatch out in Spain and North Africa. It appears that if there is a really good year that the butterflies are triggered to migrate if they reach a high population density. The butterflies migrate North utilising the prevailing SW winds. Sometimes they may go through another generation in mainland Europe before they reach us in Britain. These butterflies cannot survive a winter here at any stage of their life cycle so the individuals that make it here are doomed to die out (well some do migrate South at high altitude but most don't). The evolutionary advantage being that in North Africa the remaining individuals have enough to live on and the species continues to thrive. Depending on the numbers in Africa and the wind direction there are sometimes huge numbers of these butterflies in this country in the summer - and some years we see hardly any.
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