Variation in energy expenditure among black-legged kittiwakes: Effects of activity-specific metabolic rates and activity budgets - Jodice, P.G.R.; Roby, D.D.; Suryan, R.M.; Irons, D.B.; Kaufman, A.M.; Turco, K.R.; Visser, G. (Physiological and Biochemical Zoology, 2003)