Chaco tortoise  (Geochelone chilensis)

This tortoise's common name is taken from the Chaco regions of Argentina and Paraguay in which it lives, but the Latin name chilensis is misleading, since the species is not native to Chile (4). The oval upper shell (carapace) may be either totally yellowish brown or have dark-brown to black growth rings (annuli) surrounding a tan centre on each scute. The rim of the shell is slightly serrated and has a dark wedge of pigment at the back edge of each scute. The lower shell (plastron) may be uniformly yellowish-brown or have a dark triangular wedge along the seams of each scute. The head, limbs and tail are greyish to yellowish-brown, with the front of each forelimb covered with large, angular scales and each thigh featuring several enlarged tubercles (2).