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Quantitative Analysis of the Evolution of the Camelid Brain

The camelid brain increased in size from the Tertiary to the Quaternary periods of geological evolution. From the available data, it was impossible to determine whether increases occurred within the 30 million years of evolution during the Tertiary, represented by the sample of species studied in this report. In quantitative terms, the Tertiary camelids had brains about half as large as the brains of living camelids, taking body size into account. Relative brain size in Quaternary camelids is typical of that of living mammals.