The vaquita is the smallest porpoise species.

With adults reaching about 1.5 meters, or about 5 feet in length, and weighing 55 kilograms, the vaquita is among the smallest cetaceans in the world and is the smallest member of its genus, Phocoena. As with other porpoises, the vaquita is small but robust.

Sources: (Brownell, 1982), (EIA, 2016), (Mungia-Vega, Esquer-Garrigos, Rojas-Bracho, Vazquez-Juarez, Castro-Prieto, & Flores-Ramirez, 2007), (NOAA, 2008)
Image: Chris Huh