Stress occurs when the stimulation an animal is experiencing goes beyond that individual's ability to adapt. Environmental stress may ensue when the environment changes, adaptation status changes, or an animal is moved to another environment. When an animal has coped, its response is an adaptive response. But there always are limits to adaptability. When attempts to adapt fail, the response is a stress response, the stimulus a stressor.
Failure to adapt stress has negative consequences for animal state of being. Understanding untoward consequences of such breakdowns for bodily integrity is relatively clear-cut. But psychic disturbance or collapse is often not even recognized. It is now believed that humans can survive stress only to the extent we can cope psychologically. Likewise, Ian J. H. Duncan thinks that animal state of being has to do with animal feelings.
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