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A few Arctic-Alpine species have subspecies in the British Isles, some have been in the islands since the last Ice Age, but many spread in the immediate Sub-Arctic conditions as the ice retreated. Furthermore, these species were later reinforced by newer arrivals as the climate assumed temperatures and conditions more similar to the present day.
This page lists the bird species that have established colonies in the British Isles. Some non-native birds have established themselves and become naturalised after naturally migrating to the country and forming colonies, such as the collared dove. The list below comprises all those bird species which have occurred in a wild state in Great Britain.
Bird species admitted to the British List are those in BOU categories A, B or C: A: species that have been recorded in an apparently natural state at least once since 1 January 1950. B: species that were recorded in an apparently natural state at least once between 1 January 1800 and 31 December 1949, but have not been recorded subsequently.
a species that colonised the islands during the glacial retreat at the end of the last ice age (c. 9500 years ago); a species that was present when the English Channel was created (c. 8000 years ago); or, a species that was present in prehistory. This list includes mammals from the small islands around Great Britain and the Channel Islands.
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The list comprises butterfly species listed in The Moths and Butterflies of Great Britain and Ireland by Emmet et al. [1] and Britain's Butterflies by Tomlinson and Still. [2] A study by NERC in 2004 found there has been a species decline of 71% of butterfly species between 1983 and 2003. [3]
A bibliographic database of the species has been compiled by the Botanical Society of Britain and Ireland. [1] The lists (spread across multiple pages due to size) give an English name and a scientific name for each species, and two symbols are used to indicate status ( e for extinct species, and * for introduced species ).
The mild winters mean that many species that cannot cope with harsher conditions can winter in Britain, and also that there is a large influx of wintering birds from the European continent and beyond. There are about 250 species regularly recorded in Great Britain, and another 350 that occur with varying degrees of rarity.