.Look at animal behavior for clues

2 years ago
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However, we get clues from observing how animals behave.Wild, hurt animals are known to nurse their wounds,make noises to show their distress,
and become reclusive.In the lab, scientists have discovered that animals like chickens and rats will self-administer pain-reducing drugs if they're hurting.
Animals also avoid situations where they've been hurt before, which suggests awareness of threats.

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