First, they imply that I do not take into account the variable painience of animals from species to species and quote, rather strangely, the inclusion of the cephalopods into protective legislation as some sort of evidence of this. Well, I was among those who successfully campaigned for this protection in the 1970's and I have always emphasised that x amount of pain has the same moral importance regardless as to who or what experiences it.
No takes yet. Share an insight, caveat, or question.
Richard D. Ryder (2001) studied this question.