Protoceratops

A desert-dwelling herbivorous dinosaur that roots for food below the baked earth. They have a thick bony skull and a tough hide. They are not aggressive, but are known to charge predatory looking creatures that come too close. 

Originally Posted by Insane Pixie of the Wizards Community forums.

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A protoceratops has a body about ten feet long, stand about 3 feet high, and weighs about 500 lbs.

Protoceratops
Medium animal
Hit Dice	2d8+9 (18 hp)
Initiative	+2
Speed	30 ft. (6 squares)
Armor Class	18 (+2 Dexterity, +6 natural), touch 12, flat-footed 16
Base Attack/Grapple	+1/+3
Attack	Bite +3 melee (1d6+2) or headbutt +3 melee (1d8+3)
Full Attack	Bite +3 melee (1d6+2) and headbutt -2 melee (1d8+3)
Space/Reach	5 ft./5 ft.
Special Attacks	–
Special Qualities	Low-Light Vision, Scent
Saves	Fort +3, Ref +5, Will +1
Abilities	Strength 14, Dexterity 14, Constitution 17, Intelligence 1, Wisdom 12, Charisma 7
Skills	Listen +6, Spot +5
Feats	Alertness, Toughness
Climate/Terrain	Temperate plains
Organization	Solitary, pair, or head (5-8)
Challenge Rating	3
Treasure	None
Alignment	Always neutral
Advancement	–
Level Adjustment	–

Combat

These creatures are likely to charge and headbutt their opponents on their backs.