vaquita

kalifornianpyöriäinen, bajanpyöriäinen, vaquita A small and critically endangered porpoise, (taxlink), endemic to the northern part of the Gulf of California, Mexico.
2015 November 5, Whale of a deal, (w), https://www.newscientist.com/issue/3098%20/ Issue 3098, page 6,

THE world’s smallest porpoise may have a fighting chance. The vaquita might be saved from extinction by an agreement at a meeting of the International Whaling Commission (IWC) in Portoroz, Slovenia, last week.

Unique to the Gulf of California, the vaquita has seen its numbers collapse to 59 in 2015.