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Even that is a little contentious though, no? Even if we define sentience as the ability to feel pain (which is a bit of a simplification of sentience), the definition of pain seems fairly vague when talking about non-human animals.

AFAIK for certain groups of animals (one that comes to mind is sharks) it's very unlikely they feel anything approximating what we would call pain. Still, I imagine few advocates would say that eating shark meat is ethical behavior.

Certain animals could barely be said to do anything approximating feeling pain besides responding to external stimuli, which plants do as well.

It's a fascinating, complex topic though.




The topic of whether sharks feel pain is contested at best.




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