小頭鼠海豚是現時世上最瀕危的哺乳類動物，最新統計只餘下少於19隻，預計一年內會絕種。小頭鼠海豚是體型最小的海豚，主要是被為了非法捕捉石首魚作花膠而設的刺網所害死，或被違棄的漁網纏繞至死。
the latest statistics found that there are less than 19 vaquitas left on earth; it is currently the most endangered mammal and are expected to be extinct within a year. Vaquita is the smallest dolphin species; they are mainly threatened by illegal gillnets used to catch totoabas for their swim bladder, as well as being entangled by abandoned fishing nets.
