Technological advances including the refinement of
microchips are allowing scientists to record large
amounts of physiological data from animals wearing
implanted and telemetric devices. Meanwhile, the use of
ACTH stimulation tests and cortisol assays in samples
ranging from blood, saliva, faeces and even eggs is
becoming more commonplace as a means of plotting
trends in physiological stress responses. However, the
importance of diurnal rhythms and the possibility of
physiological fatigue as a result of chronic stress mean
that such measurements should not be interpreted in
isolation from behavioural observations.
2. Changes in behaviour, most notably t
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