Evaluation of bill furrows as age indicator in the Tufted Puffin Lunda cirrhata

• Main Authors: Tanaka,Hiroyuki, Ogi,Haruo
• Format: Report
• Language: English
• Published: Research Institute of North Pasific Fisheries, Faculty of Fisheries, Hokkaido University/Research Institute of North Pasific Fisheries, Faculty of Fisheries, Hokkaido University 1986
• Subjects: Petersen; Lunda; Lower Bill; Atlantic puffin; fratercula; Fratercula arctica; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2044; http://id.nii.ac.jp/1291/00002044/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2044&item_no=1&attribute_id=18&file_no=1

Tufted Puffins (Lunda cirrhata) were divided into six stages (F(Y), F(0)-F(4)) according to the number of bill furrows formed in the reddish outer part of the upper bill. To clarify the morphological difference between sexes and among stages, eleven morphological measurements of the bills were made....