Spotted paddle-tail newt
"Pachytriton" species are stout-bodied, smooth-skinned aquatic newts. Their heads are large and flattened, and they have conspicuous labial folds and short, stubby legs and toes. They breathe through both lungs and skin. 
"P. brevipes" ranges from 5.5 to 7.5 in as an adult. It has prominent labial folds, long digits, and smooth skin, which differs from the tuberculate skin typical of newts.
Italian crested newt
Arginine, vasotocin, and adrenocorticotropic are hormones secreted by the adrenal glands and are a key component in a newt's regulation of water. In contrast to prolactin, which decreases osmotic permeability, vasotocin increases the permeability and is secreted during the summer months. This hormone is regulated by another major hormone – adrenocorticotropic hormone (ACTH). Arginine vasotocin not only increases cutaneous water permeability, but promotes increased cutaneous blood flow.