The British avifauna is the birds that have occurred in Great Britain. This article is a general discussion of the topic. A full species list can be found at List of birds of Great Britain.
In general, the avifauna of Britain is similar to that of Europe, consisting largely of Palaearctic species. As an island, it has fewer breeding species than continental Europe, with some species, like crested lark, breeding as close as northern France, yet unable to colonise Britain.
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 continent or beyond.
There are about 250 species regularly recorded in Great Britain, and another 350 that occur with varying degrees of rarity.