Alien Giant Tortoise Helps Restore Ecosystem

Live Science: as alien species can sometimes do -- a giant tortoise appears to be helping to restore the native ecosystem. Wildlife scientists introduced Aldabra giant tortoises -- which can reach up to 661 pounds (300 kilograms) -- to an island, called Ile aux Aigrettes, off the coast of the island nation of Mauritius. By 2009, 19 adult giant tortoises called the island home. The tortoises were to replace the role of their extinct kin. [Extinct Giant Tortoises Could Be Revived] Before humans first arrived......

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