Allometric studies in plants and animals have proven to be a growth industry over the last fifty years. More recently, there has been a renewal of interest in the change in allometric slopes with increasing taxonomic level. As with other traits that have been considered, life history traits show an increase both in slope and in level of significance with increasing taxonomic level among mammals. By contrast, among lizards, the absolute value of the allometric slopes for life history traits decreases with increasing taxonomic levels, and the relationships become less significant. We discuss a variety of possible explanations for the differences in taxon-level allometric relationships between lizards and mammals
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Promislow et al. (1992) studied this question.