Giant Tortoise by Safari LtdFound predominantly on the Aldabra Atoll and Galapagos islands, the giant tortoise is a large member of the Testudines order that can grow to be over 400kgs and 1. 2m long. Their size is a result of islands gigantism, which occurs when animals are isolated on an island or islands. Unfortunately, many subspecies of giant tortoise are classified as either vulnerable or endangered, while some are already extinct. In fact, the last remaining Pinta Island