The topic of dinosaur integument is an exciting and important proponent to our understanding of the physical appearance of dinosaurs. However, physical appearance is not the only discernible feature of integument fossils, as the physiology of such integument is another important aspect of these kinds of fossils. Osteoderms and feathers are among the most well studied in terms of physiology, with non-osteoderm bearing scales more recently being investigated towards their physiological purpose. In this study, fragments of small ~3mm polygonal Diplodocus sp. scales were examined under a microscope and scanned using a micro CT scanner. Inside the scales, it was revealed that the skin possessed microscopic elongate structures which branch down from the epidermis and connect to one another. These structures create a channel of holes underneath the epidermis, making the scales porous in nature. The closest modern scales these features can be compared to are those of desert dwelling spiny lizards such as Phrynosoma and Moloch, in which the porous nature of their scales makes the integument hydrophilic in order to absorb water for drinking. In Diplodocus, it is hypothesized these scales functioned similarly. However, the absorption of water into these scales may have been used instead for thermoregulation. Water stored in the integument could evaporate from the heat in the environment and cool the skin, not unlike how elephant wrinkles function in evaporative cooling. Considering these scales originate from what is hypothesized to be the ventral side of the animal, Diplodocus may have relied on wallowing inorder to absorb water into its scales, which would then act as an artificial sweat to cool the animal down.