The Brown Hairstreak (Thecla betulae) is an endangered species which has declined in the Netherlands. The decline appears to be most significant in rural areas, whereas in urban parks and gardens the butterfly is seen in Increasing numbers. A survey was carried out in early 1995 in and around Wagenlngen (province Gelderland). More eggs were found along hedgerows in the town than in rural surroundings. It seems that Brown Hairstreaks are moving from the countryside, where modem agriculture is destroying their habitat, to the towns where the butterflies are able to find shelter and suitable shrubs in parks and gardens.