We pull taxonomic information from the Catalogue of Life database
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Training data on each taxon's mass (in grams) was obtained from unpublished primary data (MN), published allometric relationships, the primary literature, and published databases. Most mass data represent mean adult wet mass. For fishes for which Fishbase did not report mass but did report body length, we used the allometric coefficients of Froese et al. (2014) to convert length to mass. For lizards, we used the maximum snout-ventral lengths and allometric coefficients of Meiri (2018). Published mass data came from Meiri (2018), Oliveira et al. (2017), Brown et al. (2018), Smith et al. (2003), Anderson et al. (2017), Gillooly et al. (2016), Jennings et al. (2002), Lislevand et al. (2007), Killen et al. (2016), Feldman et al. (2016), Tucker et al. (2014a, b), Hirt et al. (2017), Eklof et al. (2017), Cai et al. (2015), Animal Diversity Web (via Qaardvark), AnAge (Tacutu et al., 2013), Fishbase (Froese and Pauly, 2025), Sealifebase (Palomares and Pauly, 2025), and DataRetriever (including mammal-life-hist, bird-size, home-ranges, amniote-life-hist, socean-diet-data, vertnet- amphibian, vertnet-reptiles; McGlinn et al. 2017).
Anderson, D. M. and J. F. Gillooly (2017). Physiological constraints on long-term population cycles: a broad-scale view. Evolutionary Ecology Research, 18(6), 693-707.
Brown, J. H., C. A. S. Hall, and R. M. Sibly (2018). Equal fitness paradigm explained by a trade-off between generation time and energy production rate. Nature Ecology & Evolution, 2(2), 262-268.
Cai, T., Z. Wen, Z. Jiang, and Y. Zhen (2025). Distinct latitudinal patterns of molecular rates across vertebrates. Proceedings of the National Academy of Sciences, 122(19):e2423386122.
Eklöf, J., Å. Austin, U. Bergström, S. Donadi, B. D. H. K. Eriksson, J. Hansen, and G. Sundblad (2017). Size matters: relationships between body size and body mass of common coastal, aquatic invertebrates in the Baltic Sea. PeerJ, 5, e2906.
Feldman, A., N. Sabath, R. A. Pyron, I. Mayrose, and S. Meiri (2016). Body sizes and diversification rates of lizards, snakes, amphisbaenians and the tuatara. Global Ecology and Biogeography, 25(2):187–197.
Froese R. and D. Pauly. (2025) FishBase: www.fishbase.org.
Froese, R., J. T. Thorson, and R. B. Reyes Jr. (2014). A Bayesian approach for estimating length-weight relationships in fishes. Journal of Applied Ichthyology, 30(1), 78--85.
Gillooly, J. F. J. P. Gomez, E. V. Mavrodiev, Y. Rong, and E. S. McLamore (2016). Body mass scaling of passive oxygen diffusion in endotherms and ectotherms. Proceedings of the National Academy of Sciences, 113(19):5340–5345.
Hirt, M. R., W. Jetz, B. C. Rall, and U. Brose (2017). A general scaling law reveals why the largest animals are not the fastest. Nature Ecology \& Evolution, 1(8), 1116-1122.
Jennings, S., J. K. Pinnegar, N. V. C. Polunin, and K. J. Warr (2002). Linking size-based and trophic analyses of benthic community structure.. Marine Ecology Progress Series, 226, 77-85.
Killen, S. S., D. S. Glazier, E. L. Rezende, T. D. Clark, D. Atkinson, A. S. T. Willener, and L. G. Halsey (2016). Ecological Influences and Morphological Correlates of Resting and Maximal Metabolic Rates across Teleost Fish Species. American Naturalist, 187(5), 592-606.
Lislevand, T., J. Figuerola and T. Székely (2007). Avian body sizes in relation to fecundity, mating system, display behavior, and resource sharing. Ecology, 88(6), 1605-1605.
McGlinn, D., H. Senyondo, S. Taylor, M. Pohlman, and E. White. (2017) rdataretriever: R Interface to the Data Retriever. R package version 1.0.0.
Meiri, S. (2018). Traits of lizards of the world: Variation around a successful evolutionary design. Global ecology and biogeography, 27(10), 1168-1172.
Oliveira, B. F., V. A. Sao-Pedro, G. Santos-Barrera, C. Penone, and G. C. Costa (2017) AmphiBIO, a global database for amphibian ecological traits. Scientific Data, 4(1):170123.
Palomares M. L. D. and D. Pauly (2025) SeaLifeBase: www.sealifebase.org.
Smith, F. A., S. K. Lyons, S. K. M. Ernest, K. E. Jones, D. M.Kaufman, T. Dayan, P. A.Marquet, J. H. Brown, and J. P. Haskell (2003). Body mass of late quaternary mammals (v.10.2). Ecology, 84(12), 3403--3403.
Tacutu, R., Craig, T., Budovsky, A., Wuttke, D., Lehmann, G., Taranukha, D., Costa, J., Fraifeld, V. E., de Magalhaes, J. P. (2013). Human Ageing Genomic Resources: Integrated databases and tools for the biology and genetics of ageing. Nucleic Acids Research 41(D1):D1027-D1033
Tucker, M. A. and T. L. Rogers (2014a). Examining predator--prey body size, trophic level and body mass across marine and terrestrial mammals. Proceedings of the Royal Society B: Biological Sciences, 281(1797).
Tucker, M. A., T. J. Ord, & T. L. Rogers (2014b). Evolutionary predictors of mammalian home range size: body mass, diet and the environment. Global Ecology and Biogeography, 23(10), 1105-1114.