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Fig. 6. Within the two major groups of altricial and precocial mammals, there are further grade distinctions in the scaling of gestation periods between taxonomic categories. (A) Among altricial mammals, lipotyphlan insectivores and carnivores generally have relatively longer gestation periods than myomorph rodents. (B) Among precocial mammals, primates generally have relatively longer gestation periods than artiodactyls, while the latter tend to have longer gestation periods than hystricomorph rodents overall. (Lines are least-squares regressions, used simply as a visual guide to differences between taxonomic groups.) Gestation (days); body mass (Mb in g).





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