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
Oxygen consumption has normally been determined to be the most convenient and relevant measure of metabolic activity. With very few exceptions, oxygen consumption is reduced in response to starvation and physical inactivity, and increased in fed and active animals (Hawkins, 1995). Basal maintenance metabolism in ectotherms is relatively unchanged in response to variations in atmospheric temperatures, which would be advantageous to the newt’s survival in both their aquatic and terrestrial environments where temperatures can rapidly shift throughout the year.