Fig. 1

Overview of the material and methods used in this study. Firstly, relevant taxa and their ontogenetic stages were chosen for sampling. The humeri, tibiotarsi and femora were removed and processed. After a qualitative analysis, each bone was studied using digital microscopy yielding quantitative roughness values. The measurement values in section “Material and methods” indicate the size range of each corresponding sampled bone for all four ontogenetic classes for both taxa