Can invertebrates suffer? I don't know, but I think it is a very important question for at least two reasons.
Their number. After reading a lot on the topic I would estimate the probability that insects can suffer around 10 per cent. Unfortunatly this rather low probability is more than compensated by their astronomically large number. I found two estimations of the number of insects. The lower is a billion billions, the other ten times as high. And there are vast numbers of other invertebrates like other arthropodes or worms, too.
Insecticides. Even on fields for a vegan diet countless insects are killed. Some pesticides kill slow and in potentially very cruel ways. By using more humane insecticides or by limiting the insects reproduction in other ways we could achieve a lot with little effort. If one wants to reduce suffering one of the most effective ways could be to think about insects.
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