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No, the study only included mammals. However they - and others - note that the expensive tissue hypothesis does seem to be in play in fish (such as the artificial selection study I mentioned in the post; where fish who were "evolved" to have big brains also developed a smaller gut) and a few other groups. Of course, if we're debating over whether or not data from other mammals is applicable to humans then data from fish surely suffers from the same flaws and then some! Last time I checked they didn't have fire either!