Rock cavy The rock cavies belong to the subfamily Caviinae along with the guinea pig, desert cavy, and cuis. Rock cavies are found in dry, rocky areas with low, scrubby vegetation, and they like to reside close to stony mountains and hills. In appearance and habits they closely resemble the unrelated rock hyrax of Africa (an example of convergent evolution). They usually shelter in crevices. They are reportedly seen at day and night, but are most active at dawn or dusk. Animals most active at this time are known as crepuscular. Studies show that there is a direct link between the retina
Spix's yellow-toothed cavy male approaches females in order to mate, it competes aggressively with other males. Spix's yellow-toothed cavy Spix's yellow-toothed cavy, "Galea spixii", is a rodent, a cavy species from South America. It is found in Bolivia east of the Andes and much of south central to northeastern Brazil. The species is found in open savanna and semiarid habitats, such as the Cerrado and Caatinga of Brazil. Its karyotype is 2n = 64 and FN = 118. "Galea spixii" and "G. musteloides" are similar and may actually be the same species. "G. spixii" tolerates a wide range of environmental changes, though they