The vaquita (Phocoena sinus) is a critically endangered porpoise species endemic to the northern part of the Gulf of California. It is considered the smallest and most endangered cetacean in the world.
Vaquita photo taken under permit (Oficio No. DR/488/08) from the Secretaria de Medio Ambiente y Recursos Naturales (SEMARNAT), within a natural protected area subject to special management and decreed as such by the Mexican Government. Photo: Paula Olson, NOAA