The capybara is a grazing herbivore, eating 6 to 8 pounds (2.7 to 3.6 kg) of grasses per day. Capybara are very selective feeders with four to six plant species making 75% of its diet. Capybaras are coprophagous, meaning they eat their own feces as a source of bacterial gut flora and to help digest the cellulose in the grass that forms their normal diet and extract the maximum protein from their food. They may also regurgitate food to masticate again, similar to cud-chewing by a cow.
Capybara are highly social and live in groups controlled by a dominant male. They frequently dive and may remain underwater for as long as five minutes, and can sleep with just their nose breaking the surface of the water.
They can have a life span of 8-10 years in the wild but average a life less than four years as they are “a favourite food of jaguar, puma, ocelot, eagle and caiman”.The capybara is the preferred prey of the anaconda.