Roeo (IPA: /ˈroʊdioʊ/ or /roʊˈdeɪoʊ/) is a sport which arose out of the working practices of cattle herding in Spain, Mexico, and later the United States, Canada, South America and Australia. It was based on the skills required of the working vaqueros and later, cowboys, of what today is the western United States, western Canada, and northern Mexico. Today it is a sporting event that consists of several different timed and judged events that involve cattle and horses, designed to test the skill and speed of the human cowboy and cowgirl athletes who participate.