But others over the years suspected there was something valuable there that needed to be untangled.
The current understanding equates stress with environmental conditions more than with behaviour. Romero says unhealthy stress in animals comes from extreme weather events such as storms or floods, things that go beyond what they’re adapted to. The other causes of stress are predators, famine, infectious disease, social conflicts and human-generated environmental changes — chemical and noise pollution, for example.
In a group of iguanas that survived a terrible oil spill, those with the most elevated stress hormones were more likely to die months later. Picture: 123RF/CHRIS BELLETTE Stress can help animals by shutting down fertility during times when it might be unfavourable to reproduce — when there’s too little food, for example. That’s been documented in humans, too. Women who have recently survived famines or been freed from concentration camps are unlikely to get pregnant.
Stimulation, challenge and excitement may be something we humans are adapted to live with — just as those arctic creatures are adapted to extreme cold. As I learnt from biologist Lori Marino, a lack of challenge will also stress out and sicken captive marine mammals. When they are in captivity, she said, people used to think they led “cushy” lives, with abundant food, safety and no need to work beyond performing in shows.
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