This is a list of butterflies of Great Britain, including extinct, naturalised species and those of dubious origin. The list comprises butterfly species listed in The Moths and Butterflies of Great Britain and Ireland by Emmet et al. and Britain's Butterflies by Tomlinson and Still. A study by NERC in 2004 found there has been a species decline of 71% of butterfly species between 1983 and 2003. The 2007 UK Biodiversity Action Plan (BAP) listed 22 butterfly species. The 2011 Red List of British butterflies lists 4 species as "regionally extinct" (RE), 2 as "critically endangered", 8 as "endangered (E), 9 as "vulnerable" (V), 11 as "near threatened" (NT) and 28 as "least concern" (LC) in a UK context. In the list below, the categories are as taken from the 2022 Red List (RE 4, E 8, V 16, NT 5, LC 29). Range expansions according to the 2010 Atlas of Butterflies in Britain and Ireland. Butterfly Conservation lists 29 of Great Britain's 58 breeding butterfly species as "High UK threat priority", with 9 of those with conservation priority status "Action urgent across UK range". Hesperiidae – skippers Subfamily Heteropterinae Chequered skipper – Carterocephalus palaemon LC – formerly thinly distributed in south and east, now confined to western Scotland; re-establishment project ongoing (2018–2020) Rockingham Forest, England Subfamily Hesperiinae Small skipper – Thymelicus sylvestris LC – throughout Wales and England, except far north-east and north-west; spreading north and west Essex skipper – Thymelicus lineola LC – throughout south-east England, with scattered populations in West Country and as far north as the River Humber; spreading north and west Lulworth skipper – Thymelicus acteon NT – confined to the south coast between Weymouth and Swanage Silver-spotted skipper – Hesperia comma V – restricted to southern England: east Kent, east Sussex, Surrey, Hampshire, north Dorset, south Wiltshire and the southern Chilterns; expanding distribution Large skipper – Ochlodes sylvanus LC – throughout England and Wales, and north to south-west Scotland Subfamily Pyrginae Dingy skipper – Erynnis tages tages LC – thinly distributed through much of England and Wales, and in the Scottish Highlands Grizzled skipper – Pyrgus malvae V – southern England north to north-east Wales, and south-east Wales Papilionidae – swallowtails Subfamily Papilioninae Swallowtail – Papilio machaon V P. machaon britannicus (endemic subspecies) – confined to Norfolk Broads (formerly also in The Fens) P. machaon gorganus – rare migrant and occasional breeder from Continental