The British Cavy Council governs cavy clubs in the United Kingdom. ARBA recognizes 49 breeds of rabbit and 13 cavy breeds. The guinea pig (or cavy) is noted as having an excellent swimming ability. It is also known as the Patagonian cavy, Patagonian hare, or dillaby. The capybara ("Hydrochoerus hydrochaeris") is a giant cavy rodent native to South America. Showing satin variations is prohibited by some cavy breeders' associations because of animal welfare reasons. An agouti cavy has a solid coloured belly and is otherwise fully ticked. The rock cavy belongs to the order Rodentia and the family Caviidae. They have been recognized as a cavy breed in Australia. The placenta for a rock cavy is similar to other hystricomorph rodents. A Himalayan cavy has a white body with coloured points (face, ears, feet). The maras are a genus ("Dolichotis") of the cavy family of rodents. A tortoiseshell ("tortie" for short) cavy has patches of red and black. Often referred to as the "Bad Hair Day" Cavy.