Vaquita is a Spanish word that refers to a small porpoise found only in the northern part of the Gulf of California. The word "vaquita" itself means "little cow" in Spanish. However, there are several other synonyms used to describe this mammal. Some of the common synonyms for vaquita include Gulf of California porpoise, cochito, and Californian vaquita. Another popular name for vaquita is the "world's rarest marine mammal" due to its critically endangered status. The species faces threats from bycatch in fishing nets, dwindling prey populations, and habitat degradation, making it crucial to conserve the vaquita population.