Capybaras eat their own droppings to digest tough grass a second time
The world's largest rodent survives on tough, fibrous grasses it can't fully break down in one pass, so capybaras practice coprophagy: eating certain soft droppings straight from their own bodies to send plant matter back through their gut, giving resident bacteria a second chance to extract nutrients. The strategy, also seen in rabbits, squeezes far more energy out of a diet that would otherwise be mostly indigestible fibre.