The vaquita (Phocoena sinus), also known as the Gulf of California harbor porpoise, is the smallest and rarest of the cetaceans - which include whales , dolphins , and porpoises. The vaquita has a gray body with a pale gray or white belly and a dark patch around its eye. They are very rarely seen in the wild.
Vaquitas eat ocean fish such as Gulf croaker and bronze-striped grunts. They are also known to eat squid.
Approximately 400 to 600 vaquitas may remain in the wild.
Vaquitas have the most restricted range of any marine cetacean. They appear to live only in the northern end of the Gulf of California. The Mexican government created the Upper Gulf of California Biosphere Reserve in 1993 in part to protect vaquita habitat.
Vaquitas use sonar to communicate and navigate Gulf waters. When seen, they are either alone or in small groups of two or three. The vaquita is also the only porpoise species found in such warm waters.
Mating Season: April to May.
Gestation: 10-11 months.
Number of offspring: 1 calf.
A female will give birth every 2 years or so. Calves are between 28-31 inches long at birth, weighing about 17 lbs.
The greatest threat to the remaining vaquita is incidental death caused by fishing gear. Vaquitas are known to die in gillnets set for sharks , rays, mackerels and chano, as well as in illegal and occasionally permitted gillnet sets for an endangered fish called totoaba. They are also killed by commercial shrimp trawlers. It is believed that about 30 vaquitas are lost to these threats each year.
Because there are so few vaquita left and they are confined to such a small area, they may also be vulnerable to climate change , which could affect food availability or habitat  conditions in the Gulf of California.