Genus Crax refers to a group of bird species that belong to the family Cracidae. The term Crax is often used interchangeably with the word curassow, which is a synonym for the same bird group. The term curassow has been derived from the Portuguese word "caracol," which means horn, referring to the bird's raised, horn-like casque on its head. Some of the other common synonyms for genus Crax include the Andean guan, white-crested guan, and yellow-knobbed curassow. These birds are primarily found in the tropical rainforests of Central and South America and are known for their striking plumage and distinctive features.