|Common Name||Cochito, Desert Porpoise, Gulf of California Harbor Porpoise, Gulf of California Porpoise, and Gulf Porpoise.|
|Range||Gulf of California|
The Vaquita, (Phocoena sinus), is a rare species of porpoise. It is endemic to the northern part of the Gulf of California. Estimates of the number of individuals alive range from 100 to 300. The word "vaquita" is Spanish for little cow. Since the baiji is believed to have gone extinct in 2006, the vaquita has taken on the title of the most endangered cetacean in the world.
Other names include cochito, desert porpoise, Gulf of California harbor porpoise, Gulf of California porpoise, and gulf porpoise.
There are very few records of the vaquita in the wild. They appear to swim and feed in a leisurely manner, but they are elusive and will avoid boats of any kind. Vaquitas rise to breathe with a slow, forward-rolling movement that barely disturbs the surface of the water, and then disappear quickly, often for a long time. In order to explore their environment and communicate with each other, vaquitas use sonar and produce high-frequency clicks that are used in echolocation.