Geometric tortoise  (Psammobates geometricus)

The geometric tortoise, a medium-sized terrestrial tortoise, is the rarest of the three Psammobates (tent tortoise) species restricted to southern Africa (4) (5). It is named for the pattern adorning its high, domed shell, which occasionally may be perfectly geometric (6). The shell is dark brown or black and each scute has yellow stripes radiating out from a yellow centre (7). The rear edges of the shell are slightly upturned. Female geometric tortoises can be distinguished by their larger size and smaller tail (6), while the males typically have a concave plastron, or lower shell (2).