Phocoena sinus is the smallest of all cetaceans, with a stocky physique. Dorsal fin prominent, shark-like fin. It has a rounded head and almost no beak. Dark circles around the eyes. The complex, dull grey pattern of the body, in some light, approximates olive or tawny, an impression that observers generally describe as “dark”. Due to its very narrow distribution range, it is unlikely to be confused with other varieties; But few observations have been recorded in the wild.
The Porpoises are often referred to as Cochito, but the name can be confusing because local fishermen often use it to refer to all small cetaceans. Shy and withdrawn by nature, porpoises usually catch a fleeting glimpse, but never return. You can’t see them until they’re caught in a fishing net.
The Bay porpoises are endemic to the northern Gulf of California, with an estimated population of fewer than 300, and they are likely to disappear for good by 2018. The narrow habitat and the ability to get caught in fishing nets are the main reasons for their danger.