There are lots of orange tip butterflies around just now. I'm always amazed at the difference between the male butterfly's upper and under wings. When open the wing tips are a startling orange (bottom picture) which is very obvious from quite a distance. But when closed the underside of the wings merges completely into the white flower heads of the cow parsley (top picture)
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Saw some Orange tip butterflies in my daughter's garden two weeks ago. They were 'visiting' cuckoo flowers.