Lizardmen Saurus, Kroxigor, Terradons, Salamanders, Stegadons and even Skinks (even though skinks are actually amphibians and not really lizards !) benefit from being cold-blooded.
This means they can roll 3D6 instead of 2D6 for ALL leadership tests (yep, fear, terror, panic, break, rally - every Ld test infact).
Now this is extremely "cool" for Lizardmen. The table on the right shows a comparison between rolling "less than or equal to" on 2D6 and 3D6.
Saurus and Temple Gaurd have a leadership of 8, if they were rolling with 2D6 they would pass about 3 out of 4 dice rolls. But because they are rolling on 3D6 they pass almost 9 out of 10 rolls !
Over the course of a battle this is a massive advantage (as a rule of thumb Lizardman leadership is 2 pts more effective) Eg. A lizardman unit with leadership 7 is equivalent to any other army unit with a leadership 9.
Therefore rejoice if you are playing a Lizardman army and beware if you are facing one.
