Like other tortoises, Galápagos tortoises are herbivores. They eat cacti, grasses, leaves, lichens, and berries.
Though mating can occur any time of the year, it sometimes has seasonal peaks between February and June. When mature males meet in the mating season, they will face each other in a dominance display, rise up on their legs, and stretch up their necks with their mouths gaping open. They sometimes bite each other's head, but the shorter one will eventually back down and give the victory of mating the female that they are fighting over to the other one.