ABN stands for Advanced Beneficiary Notification. An ABN must be signed prior to providing a Medicare service or test to document that the patient is willing to assume responsibility for payment of services that Medicare may not cover when subject to either National or Local Coverage Determinations (NCD) or (LCD).
Chinchillas are crepuscular (most active around dawn and dusk) rodents, slightly larger and more robust than ground squirrels. They are native to the Andes mountains in South America and live in colonies called  herds  at high elevations up to 4,270 m (14,000 ft).
Chinchillas do not bathe in water but sand (also referred to as dust). In the wild, chinchillas will bathe in volcanic ash. You can buy chinchilla dust from a reputable pet shop. They need to bathe/roll in the sand to clean and look after their thick coat.