The BBC's security correspondent Frank Gardner - a keen naturalist - has been on their trail.
By Frank GardnerBlink and you could miss them - but mysterious sightings of an extremely rare butterfly have set the hearts of enthusiasts fluttering.
Small numbers of black-veined whites have been spotted flying in fields and hedgerows in south-east London. This month they have mysteriously appeared among their favourite habitat: hawthorn and blackthorn trees on the edge of London, where I and other naturalists watched them flitting between hedgerows.
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