their definitive plumage at around three years. Juvenile females look almost identical to their adult counterparts. Guianan cocks-of-the-rock have a total length of approximately and a total weight of around . The two species of cock-of-the-rock are allopatric, and therefore do not meet with one another. The plumage of the male Andean cock-of-the-rock is redder and its wings are mostly black, lacking the orange colouration seen on the male Guianan. The female Andean cock-of-the-rock is reddish brown rather than the brownish-gray of the Guianan. Etymology The generic and specific names are derived from the Latin words rupes "rock" or "cliff", and cola "inhabiting", which express its habit of nesting on rock walls. Taxonomy The Guianan cock-of-the-rock is one of two species of genus Rupicola. It was described by Carl Linnaeus in 1766 as the type species of its genus. Its closest relative and congener, the Andean cock-of-the-rock (Rupicola peruvianus), is similar in body shape and colouration, though the two are wholly allopatric from each other. Their closest family relatives are the Red cotingas (Genus Phoenicircus). The two Rupicola species are in the subfamily Rupicolinae, which also includes other species of cotingas such as the before-mentioned Red cotingas (Genus Phoenicircus, which is a sister genus to Rupicola), Snowornis pihas, and the berryeaters (Genus Carpornis). Range and habitat As suggested by its name, the Guianan cock-of-the-rock is found in the Guianan Shield, occurring in French Guiana, Suriname, Guyana, southern Venezuela, eastern Colombia and northern Amazonian Brazil. Its preferred habitats are humid forests near rocky outcrops. They are normally found at an altitude of . The Guianan cock-of-the-rock has distinctive territorial markings. Males usually take dominance of an area on the ground, although sometimes they occupy middle strata in forests. They make their characteristic marking by clearing out debris from the ground, including twigs, leaves, and pellets. This area is called a “court”. Quality of courts are known to have some influence on mate choice. The court quality is determined by the territory density and location to the center of activity in the lek. The reason for the focus on the center of activity in the lek is that successful males tended to own courts in the most densely clustered lek areas. Guianan courts are commonly found in the Guianan Shield, a forested region in northeastern South America. Ecology and behavior Diet The diet of the adult Guianan cock-of-the-rock consists mainly of fruits