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British Butterflies - This site provides information on all of the butterfly species in the UK, including those that are extinct or migrants.

British Butterflies - A new site devoted to British Butterflies.

Butterfly Conservation - Butterfly Conservation's purpose is to secure a lasting future for all native butterflies, moths and their habitats within the UK.

Butterfly Conservation - Yorkshire Branch - This Web Site has been set up to publicise some of the efforts of the Yorkshire Branch of Butterfly Conservation in Yorkshire and its activities and as a resource for members and non-members.

Butterfly Monitoring Scheme - The United Kingdom Butterfly Monitoring Scheme (BMS) was set up in 1976 to provide information on changes in the abundance of butterflies at selected monitored sites throughout the United Kingdom. From this information, national fluctuations and trends in butterfly numbers can be inferred

Immigration of Lepidoptera - A site to enable those with an interest in migrating lepidoptera to send in details of, or view, the latest sightings in Great Britain and Ireland free of charge.

Moths and Butterflies of Europe - The aim of this work is to provide a large iconographic sample of European moths and butterflies and, for each species, information about foodplants, breeding, life cycle.

The Cockayne Database - The Cockayne Trust, in collaboration with The Natural History Museum, is supporting the Cockayne Website which aims to provide free access to a comprehensive atlas of British butterflies and moths, illustrating all native and introduced species and their variation.