Collins BTO Guide to Rare British BirdsIn a unique new collaboration, Collins have paired up with the respected British Trust for Ornithology, bringing together the most authoritative and up to date information in this new field guide to the rare birds of Britain and Ireland. 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