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The Journal of Experimental Biology|March 16, 2001
Seasonal hypothermia in a large migrating bird: saving energy for fat deposition?P J Butler, A J WoakesThe Journal of Experimental Biology|January 1, 1984
Heart rate and aerobic metabolism in Humboldt penguins, Spheniscus humboldti, during voluntary divesP J Butler, A J WoakesJournal of Applied Physiology: Respiratory, Environmental and Exercise Physiology|December 1, 1982
Control of heart rate by carotid body chemoreceptors during diving in tufted ducksP J Butler, A J WoakesBiotelemetry|January 1, 1975
An implantable transmitter for monitoring heart rate and respiratory frequency in diving ducksA J Woakes, P J ButlerRespiration Physiology|September 1, 1987
Heart rate in humans during underwater swimming with and without breath-holdP J Butler, A J WoakesThe Journal of Experimental Biology|November 1, 1986
Diving behaviour and heart rate in tufted ducks (Aythya fuligula)R Stephenson, P J Butler, A J WoakesMedical & Biological Engineering & Computing|March 1, 1995
Implantable data logging system for heart rate and body temperature: its application to the estimation of field metabolic rates in Antarctic predatorsA J Woakes, P J Butler, R M BevanThe Journal of Experimental Biology|July 7, 2001
Heart rate as an indicator of oxygen consumption: influence of body condition in the king penguinG Froget, P J Butler, Y Handrich, et al.Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology|September 5, 2002
The energetics of barnacle geese (Branta leucopsis) flying in captive and wild conditionsC M Bishop, S Ward, A J Woakes, et al.Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology|August 30, 2000
Heart rate and rate of oxygen consumption during flight of the barnacle goose, Branta leucopsisP J Butler, A J Woakes, R M Bevan, et al.Pageof 4