Supplementary material to "Growth orientations, rather than heterogeneous growth rates, dominate embryonic joint morphogenesis in the zebrafish jaw" by Josepha Godivier, Elizabeth A. Lawrence, Mengdi Wang, Chrissy L. Hammond & Niamh C. Nowlan. Supplementary figures are available. "Shape averaging" contains all mimics and 3-matic (Materialise NV, Leuven, Belgium) files containing the raw confocal images used for shape averaging, along with the Matlab (R2018a, The MathWorks, Inc., Natick, Massachusetts, United States) scripts used to generate the average shapes. Results are stored in a 3-matic file "FreeMvt wt_AVG_alltimeframes.mxp" and in .stl format. "Strain rate calculations" contains raw and filtered confocal images, all Matlab scripts used to extract the 12-hour time period strain rates from them and results stored in .mat files. "Abaqus models" contains the .cae files of the 3 simulation types (heterogeneous anisotropic (HET), homogeneous anisotropic (HOMO), heterogeneous isotropic (ISO)), for all 4 time windows, along with all job inputs and odb (Abaqus CAE, Dassault Systemes, 2019). Raw predicted shapes are stored in .stl format and in .mxp where they were aligned with the average shapes.