Flight-feather molt patterns and age in North American owls
By: by Peter Pyle.
Series: Monographs in field ornithology ;; no. 2
Publisher: American Birding Association
Published: 1997
Place of publication: Colorado Springs, CO
Language: eng
Number of pages: 32
Subjects: Owls -- North America -- Age determination.; Molting.
Notes: Includes bibliographical references.