The Galapagos tortoise is herbivorous and can eat cacti, grasses, leaves, moss, lichens and berries. A Galapagos tortoise can eat an average of 32-36 kilograms per day, but the inefficient digestive system makes the Galapagos tortoise very limited in nutrient absorption.

Water in Galapagos tortoises Most of their intake comes from dew and plant sap, so they can go without water for long periods of time and survive for 18 months if deprived of all food and water. When thirsty, the Galapagos tortoise will drink a lot of water very quickly, storing it in its own bladder or in the pericardium of the neck, which are the two places where the Galapagos tortoise is stored Water source, so that they can not drink water for a long time. On arid islands, Galapagos tortoises lick early morning dew on boulders, as repeated licking by multiple generations of Galapagos tortoises has created half-circle depressions in many rocks .