Tiger salamanders' markings are variable throughout their extensive range, but the most common marking resembles the vertically striped pattern of their mammalian namesake.
All are air-breathing, warm-blooded mammals that nurse their young. The difference between a dolphin and a porpoise has to do with their appearance: dolphins have longer snouts, bigger mouths, more curved dorsal fins, and longer, leaner bodies than porpoises. 1  Share on Facebook.  Tweet on Twitter.
Porpoise. Porpoises belong to the Family: Phocoenidae, and contain only six living species with some in freshwater. Scientists believe that these animals evolved before 23 million years ago according to fossil evidences. They have streamlined bodies, which are more compact and shorter compared to other cetaceans.