Collins BTO Guide to Rare British Birds

This book is the companion volume to the Collins BTO Guide to British Birds. It covers all the rare and scarce birds that have occurred in Britain and Ireland four times or more, as of February 2015. ‘The Rarest of the Rare’ section lists all the species that have occurred fewer than four times; taken in combination, this means that every species of wild bird that has ever occurred in Britain is mentioned.