A giant South American rodent weighing at least 100 pounds is captured on camera at a waste-water treatment facility in California recently before disappearing in the brush.  The animal, identified as a capybara, is the world's largest rodent and feeds on vegetation.  ‘If you think a giant guinea pig is cute, then you probably would like it,’ said Todd Tognazzini, of the California Department of Fish and Game.  Sew there you are: The capybara - thought to be an escaped pet - wanders away from the water-treatment plant in Paso Robles  The capybara is believed to be an escaped pet, Tognazzini said.  The animal was spotted at the waste-water treatment facility in Paso Robles, 175miles north-west of Los Angles.  An employee at the plant took photos of the animal as it crawled out of a pond.  CAPYBARA - RATTING OUT THE KEY FACTS  The capybara is a supersized relative of the rat and mouse that normally live in grassy wetlands and near rivers.  They can grow to a metre in length and have teeth that never stop growing, as they get worn down by eating grasses, their favourite food.  In fact, capybara means ‘master of the grasses’ in the tongue of the South American Guarani Indians.  Capybara also love water - they have webbed toes to propel them through it - and often mate in it.  They live in groups of 10 to 100 individuals, each one led by a dominant male.