Galápagos Tortoise

Geochelone nigra microphyes

With few natural predators and competitors for food, the Galápagos tortoise grew over time into the largest turtle in the world. Once a popular food source for sailors, the tortoise is now protected from hunting. Today, introduced predators are the problem. Dogs, cats, and rats eat the tortoise’s eggs and livestock compete for food.

More info

On his famous voyage to the Galápagos Islands in 1835, Charles Darwin noted a distinct physical difference among the shells of Galápagos tortoises on different islands. Tortoises that fed primarily on ground vegetation had large domed shells. Tortoises that fed on above-ground plants had saddle-shaped shells with a curved front that enabled them to stretch their necks up higher. This observation informed his theory of evolution by natural selection, which has become the cornerstone of modern biological science.

  • As one of the longest-lived animals, a Galápagos tortoise can lives 150 years or more.
  • The Galápagos tortoise sleeps about 16 hours a day.
  • Survive a year without eating or drinking? The Galápagos tortoise can do it!
  • Made up of honeycomb structures, the tortoise’s shell is much lighter and easier to carry than if it were solid.

Fact File

Species @ Risk Image
where to see themWhere to see them: Reptile House
lengthLength: Up to 6 ft
weightWeight: 300 to 550 lbs
habitatHabitat: Dry grasslands
dietDiet: Cactus, fruit, flowers, leaves, and grasses
exclamationRisk Status: Species at Risk (IUCN-Vulnerable)