The Spur-thighed Tortoise or Greek Tortoise (Testudo graeca) is often confused with Hermann's Tortoise (Testudo hermanni).
However, there are some notable differences:

1. The Spur-thighed Tortoise has one whole shield plate above the tail where Hermann's Tortoise has this shield plate split in two;
2. The Spur-thighed Tortoise has notable spurs on each thigh where the Hermann's Tortoise doesn't;
3. The Spur-thighed Tortoise (usually) has large scales on the front legs where Hermann's Tortoise has small scales;
4. The Spur-thighed Tortoise (usually) has large symmetrical markings on the top of the head where Hermann's Tortoise has only small scales;
5. The Spur-thighed Tortoise (usually) has a dark central fleck on the underside (plastron) where Hermann's Tortoise has two black bands.

1st photo: Lesvos, Greece, 6 May 2010
2nd photo: Lesvos, Greece, 25 April 2010
3rd photo: Lesvos, Greece, 1 May 2010
4th photo: Athens, Greece, 29 October 2008