Ptilochronology : Oxford University Press : 9780199295500 : 0199295506 : 29 Jun 2006 : This is the first book to summarize the methods, conceptual issues and results of studies using the interpretation of feather growth rates as an index to nutritional condition in birds. The author has coined the term ptilochronology (literally. 'the study of feather time') to describe this technique, which relies on the fat that as a feather grows it produces visible growth bars. Both the technique and its conceptual foundations have been applied worldwide to numerous studies of avian evolution, ecology, and conservation biology. the author reviews this work, chronicles the various criticisms that have been amde, and describes how these have influenced the development of ptilochronology. He goes on to suggest experimental methodologies and analytical techniques to safeguard against invalid results. a final chapter summarises this new technique's contribution to avian biology, and suggests potential a