Diet is important in capybara life for example An adult capybara can eat 6-8 pounds of grass daily. Herbivorous Diet As strict herbivores, capybaras mostly consume grasses and aquatic plants for sustenance. Coprophagy Coprophagy is the habit of capybaras whereby they eat their excrement. Feeding Behavior Since capybaras are crepuscular feeders, dawn and dusk are when they are most active. This is all about the capybara Diet.