I believe that only specific classes of animals can experience suffering. Probably most higher mammals (as they have homologous circuitry to ours associated with suffering) and birds (who evolved parallel to us and developed a lot of similar brain functionality).
I don't think plants, insects, or bacteria have feelings. Reptiles, fish, and amphibians (and other non-mammalian vertebrates) are in more of a difficult place to determine the extent of their conscious experience.
I still eat birds and mammals though, because I can't handle a vegetarian diet psychologically (I have tried).
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