The Radiated Tortoise, named after the fine lines "radiating" out from the centre point of each section of its shell, is native Madagascar -- originally and mainly in the south of the island.
The dark shell with light lines is generally a smoother dome than on the related, knobblier, Star Tortoises; however, individuals vary (the pyramids are not just a result of too rich diet as in some species). The younger tortoises are more sharply marked and the shell darkens with age (unlike Stars, which lighten with age). They can live well over 100 years.
A Gecko warms itself on a "radiator".
Indian Star Tortoise
The Indian Star Tortoise, named after the attractive markings on its "carapace" (upper shell), is native to India and Sri Lanka. The markings are for camouflage.
Unlike the Radiated Tortoise above, the Star Tortoise has a light shell background with dark markings which fade and lighten with age. They can live over 100 years old.