rectly through new and ground~breaking work made avail- have helped greatly in a variety of ways, as well as provide the These advances in knowledge have had the effect that a & doves, thrushes, warblers, shrikes) we are pleased to have interested in birds and natural history, the specialist jargon from hatching until 31 Dec of the same year, in its 2nd taxonomy would take a big leap- after a long period of when there is no underlying taxonomic change. With contin-

measurements in the current literature are misleading. eclipse plumage- cryptic, female-lil

after publication of the first edition it was evident that it was have decided to await further research and more universal The Collins Bird Guide App combines world-class illustrations and comprehensive information with intuitive design to create the ultimate field guide to the birds of Britain and Europe. For passionate birders and casual birdwatchers alike. L-":"=_--=-:...-:::.~.~ :=::=k~J Winter range. immature (ilnm.) - a bird wearing any plumage other than tude of this normal size variation, and it is all too easy then difficult to establish, e.g. among larger gulls or rap tors.Olsen, Urban Olsson, Eugeny Panov, David Parkin, Mike jendijk, les Meulmeester, Mars Muusse, Theodoor Muusse.