Did you know that all tortoises have a bony shell made of hard plates that protect their soft bodies. The overall size, colours and features of tortoise shells and bodies vary from species to species. Generally shells are tones of brown, blacks and buffs with quite a bit of yellow in the case of the Hermann’s tortoise. The spur-thighed tortoise has a bony spur on the rear of each thigh, whereas the Horsfield’s tortoise has a claw on the tip of its tail. The marginated tortoise is the largest and darkest of these land tortoises; it grows to 30cm in length, with the edge of the upper shell of adults being splayed out at the back.