aldabra giant tortoise

adaptation aldabra aldabrachelys anatomy animal art atoll behavior biodiversity boulder breeding challenges characteristics comparison conservation diet diversity ecological ecology ecosystem endangered endemic enormous evolution exotic facts family fauna galápagos giant gigantea grazing growth habitat herbivore herbivorous initiatives island land largest lifespan longevity mammal metabolism migration native nominate patterns pond protection reptile reptilian reserve rock role saddle-shaped sanctuary sculpture seychelles shell size slow slow-moving species subspecies testudinidae tortoise tortoises turtle unique vulnerable water wildlife wood world zoo