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
Newts of many different species are often found congregating in ponds, therefore niche overlap is very common. "T. carnifex" has adapted a specialized niche, to avoid species competition. Fasola (1993) discovered that during reproduction, water depth is the most important factor, and to avoid competition "T. carnifex" reproduces in deeper waters. Compared to most adult newts, "T. carnifex" is significantly more nocturnal and this helps to reduce resource competition between other newts who are more active during the day. During metamorphosis, "T. carnifex" becomes roughly eleven times heavier than other smaller newt species in a specific pond. The weight of "T. carnifex" allows it to prey on other species of newts, and therefore allows for an increase in its survival rate. Buskirk (2007) found that when "T. carnifex" was exposed to smaller species of newts, such as "T. helveticus", they caused delayed metamorphosis and decreased fitness in "T. helveticus". Conversely, when exposed to a newt species that had a larger body mass, "T. carnifex" did not affect metamorphosis or fitness in the opposite newt. Buskirk proposed that body size of Triturus newts plays a large role in the determination of species interactions in a natural wetland environment. Due to the larger body size of "T. carnifex", positive interactions with other smaller newt species is limited and allows for more resources and environment for "T. carnifex".