FREQUENCY: Common (Cretaceous - OSRIC.186)
FREQUENCY: Common ([Tropical Wilderness Hills], [Tropical Wilderness Swamp], [Tropical Wilderness Plains])
FREQUENCY: Rare ([Tropical Wilderness Mountains], [Tropical Wilderness Forest], [Tropical Wilderness Desert])
NO. APPEARING: 3-18
ARMOR CLASS: 4
MOVE: 15"
HIT DICE: 6
% IN LAIR: Nil
TREASURE TYPE: Nil
NO. OF ATTACKS: 3 ~ 13
DAMAGE/ATTACK: 1-3/1-3/2-8 (spike/spike/tail)
SPECIAL ATTACKS: Nil
SPECIAL DEFENSES: Nil
INTELLIGENCE: Non-
ALIGNMENT: Neutral
SIZE: L (30' long)
LEVEL/X.P. VALUE: III | 150 + 6

SAVES:

These typically bipedal plant-eaters typically travel in herds.
They run from carnivores, but if cornered they will employ their "thumb" spikes and lashing tail to defend themselves.
<see DMG note at Dinosaur : applies to Iguanadon?>