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vaquita
The vaquita (''Phocoena sinus'') is a rare species of porpoise. It is endemic to the northern part of the Gulf of California. It is listed as critically endangered because the estimated number of individuals dropped below 100 in 2014, putting it in imminent danger of extinction. Since the baiji (''Lipotes vexillifer'') is believed to have gone extinct by 2006, the vaquita has taken on the title of the most endangered cetacean in the world.
The word "vaquita" is Spanish for ''little cow''. Other names include cochito, desert porpoise, Gulf of California harbor porpoise, Gulf of California porpoise, and gulf porpoise.
==Description==
Vaquitas are the smallest and most endangered species of the cetacean order and are endemic to the northern end of the Gulf of California. The vaquita is stocky and has a classic porpoise shape. The species is distinguishable by the dark rings surrounding their eyes, patches on their lips, and a line that extends from their dorsal fins to their mouth. Their back is a dark grey that fades to a white underside. As vaquitas mature, the shades of grey lighten.
Female vaquitas tend to grow to be a bit larger than the male. Females usually end up at a length of , compared to the males . The lifespan, pattern of growth, seasonal reproduction, and testis size of the vaquita are all similar to that of the harbour porpoise. The flippers are proportionately larger than other porpoises' and the fin is taller and more falcate. The skull is smaller and the rostrum is shorter and broader than in other members of the genus. The females are discernible from the males due to their larger size.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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