Parental provisioning, nestling departure decisions and prefledging mass recession in Cassin’s auklets

YOLANDA E. MORBEY*, RONALD C. YDENBERG*, HUGH A. KNECHTEL* & ANNE HARFENIST† *Simon Fraser University †Canadian Wildlife Service, Delta, British Columbia (Received 2 January 1998; initial acceptance 30 April 1998; final acceptance 13 October 1998; MS. number: A8109)  ANIMAL BEHAVIOUR, 1999, 57, 873–881 Article No. anbe.1998.1039, available online at http://www.idealibrary.com on We investigated how parental