Fig. 2
From: Quantification of bone surface textures: exploring a new method of ontogenetic ageing
Qualitative roughness data for Ardea cinerea of different ontogenetic stage. Images are from the tibiotarsi, and are taken along the bone’s long axis in distal to proximal direction. Chicks show the highest number of large and deep grooves and pits. Hatchlings and juveniles show clear roughness patterns, but only very few penetrating pores. Adults are almost completely smooth