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Life

Giant tortoises are rare today but once roamed four continents

By Colin Barras

13 December 2017

Tortoise

Its ancestors roamed the continents for millions of years

Frans Lanting/FLPA

TORTOISES evolved into giants on at least seven occasions and on four continents. The finding undermines the long-standing idea that tortoises become enormous only if they are stranded on remote islands.

There are more than 40 species of , the most spectacular being the giant tortoises. On the Galapagos islands in the Pacific and Seychelles islands in the Indian Ocean, these animals can have shells more than 120 centimetres long.

These islands cover just a few thousand square kilometres. In contrast, Earth’s continents cover 150 million square kilometres.…

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