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" ... These ethical worries strike me as similar to those we face when we grapple with biomedical research with non-human primates. Researchers want experimental models that are as close as possible to the target system they are using the model to understand. But, if a creature is enough like a human that we can use it in experiments to model humans, we might start to worry that it is also enough like us in terms of intelligence, or self-awareness, or whichever characteristic we identify as central to moral considerability, that we cross an ethical line by experimenting on that creature in the first place. ... "