Behaviour is intrinsically objective- it is not private to the induvidual who is behaving
Welfare is by nature subjective and private to the induvidual
Both can be measured objectively (e.g. rates, frequencies, durations) or subjectively (e.g. scoring systems)- which is better depends on how quantifible the observable signs are, and what the aim is
Behaviour is usually quantified as frequencies, durations etc. It can also be rated qualtatively,
Welfare is measured using behavioural, physiological or environmental indicators.
The field of animal cognition uses behaviour to investigate animals ability to learn, remember, understand, predict etc
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