Sylvia Warblers (Helm Identification Guides)
Contributors: Alan Harris (Illustrator)
Publisher: Christopher Helm Publishers Ltd
Published: May 31, 2001
Format: Hardcover
Number of pages: 576
ISBN-13: 9780713639841
Subjects: Birds (ornithology); Reference works; Taxonomy & systematics; Science/Mathematics
First sentence: In all Sylvia warblers, iris colour is a very useful ageing criterion in autumn, but much less so in spring.