a reptile and they have undies
a reptile that can live in water and also on land
a reptile with a bony or leathery shell
a symbol for the avoiding style because it can avoid everything by pulling its head and legs into its shell to get away from everyone
a type of robot which moves round on wheels on a flat surface
The general term for any of the various aquatic or terrestrial reptiles of the order Testudines (or Chelonia); having horny, toothless jaws and a bony or leathery shell into which the head, limbs and tail can be withdrawn in most species. Terrapins and Tortoises both fall under the title of 'Turtles'.
Turtles are reptiles of the order Testudines (all living turtles belong to the crown group Chelonia), most of whose body is shielded by a special bony or cartilagenous shell developed from their ribs. The Order Testudines includes both extant (living) and extinct species, the earliest turtles being known from the early Triassic Period, making turtles one of the oldest reptile groups, and a much more ancient group than the lizards and snakes. About 300 species are alive today.
Turtles are a class of educational robots designed originally in the late 1940s (largely under the auspices of Anglo-American researcher William Grey Walter) and used in computer science and mechanical engineering training. Such devices are traditionally built low to the ground, traditionally with a roughly hemispheric (sometimes transparent) shell, with a power train capable of a very small turning radius, and often including sensor devices to avoid obstacles and, if the robot is sufficiently sophisticated, allow the robot to have some perception of its environment. Turtle robots are commercially available, and are also common projects for robotics hobbyists.