Avoidance of physical activity is a sensitive indicator of illness
Publication/Journal: Physiology & Behavior
Keywords: anorexia, fever, lethargy, sickness behavior, voluntary wheel running
2009
Sexual selection is not the origin of long necks in giraffes
Publication/Journal: Journal of Zoology
Keywords: evolution, giraffe, morphology, sexual selection
2009
Operant Behavior
Publication/Journal: American Psychologist
Keywords: operant behavior, operant behaviour, operant conditioning
1963