Slaapgezelschappen bij Groot geaderde witjes

During a summer holiday in France, a butterfly watcher made some observations on the roosting behaviour of Black-veined Whites (Aporia crataegi). He noticed that in a meadow, the butterflies perched predominantly on ox-eye daisy and cat's ear. Not only were there flowers with solitary butterflies, other flower-heads carried groups of between two and fifteen specimens. A clear explanation for this roosting behaviour cannot be given, though it may in some way be connected to the vegetation structure In the grassland.