Giant tortoises have evolved on a number of tropical islands. They can weigh as much as 3 or 400 kg (660880 lbs) and can grow to be 1.3 to 1.9 m (45.9 ft) long (accounts vary). They live, or lived (some species are recently extinct), in the Seychelles, the Mascarenes and the Galapagos. Today, the world's largest population lives on Aldabra Atoll in Seychelles, where there are about 150,000 individuals. Although looking similar, the tortoises represent separate branches of evolution. The Seychelles and Mascarenes tortoises came originally from nearby Madagascar, while the Galapagos tortoises came from nearby Ecuador. Their similarity is an example of convergent evolution.