Pete Fraser is a freelance ornithologist. He runs birdwatching tours of Britain for foreign visitors, conducts surveys and is the producer of the bird-recording software package COBRA. Since postgraduate study in environmental toxicology at London University in 1984, he has established the database of scarce migrant and rare birds in Britain and Ireland used in the production of this book. He is the statistician for the British Birds Rarities Committee and co-author of Rare Birds in Britain and Ireland (T. & A. D. Poyser, 1989).