The vaquita, which means "little cow" in Spanish, is the world's smallest porpoise and most endangered marine mammal. They also have the smallest range of any marine mammal; about 1,500 square miles within the northern Gulf of California. Since 1997, vaquitas have experienced a dramatic population loss from about 600 individuals to an estimate of less than 10 animals to date. At this current rate, vaquitas are expected to become extinct imminently.