R Dataset / Package MASS / mammals

On this R-data statistics page, you will find information about the mammals data set which pertains to Brain and Body Weights for 62 Species of Land Mammals. The mammals data set is found in the MASS R package. You can load the mammals data set in R by issuing the following command at the console data("mammals"). This will load the data into a variable called mammals. If R says the mammals data set is not found, you can try installing the package by issuing this command install.packages("MASS") and then attempt to reload the data with the library() command. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the mammals R data set. The size of this file is about 1,272 bytes.

Brain and Body Weights for 62 Species of Land Mammals


A data frame with average brain and body weights for 62 species of land mammals.





body weight in kg.


brain weight in g.


Common name of species. (Rock hyrax-a = Heterohyrax brucci, Rock hyrax-b = Procavia habessinic..)


Weisberg, S. (1985) Applied Linear Regression. 2nd edition. Wiley, pp. 144–5.

Selected from: Allison, T. and Cicchetti, D. V. (1976) Sleep in mammals: ecological and constitutional correlates. Science 194, 732–734.


Venables, W. N. and Ripley, B. D. (1999) Modern Applied Statistics with S-PLUS. Third Edition. Springer.

Dataset imported from https://www.r-project.org.

Attachments: csv, json

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