1. Changing heart rates of herring gulls when approached by humans;Ball,1980
2. Bradycardia in response to threat;Belkin;Am Soc Zool,1968
3. Bodily Changes in Pain, Hunger, Fear and Rage;Cannon,1929
4. Control of fear bradycardia in the swamp rabbit, Sylvilagus aquaticus;Causby;Comp Biochem Physiol,1981
5. The use of radiotelemetry devices to measure temperature and heart rate in domestic fowl;Duncan,1980