Ornithosuchus

Ornithosuchus somewhat resembles a theropod dinosaur, though it often walks quadrupedally, but is not. It is actually more closely related to crocodiles. It is about 12 feet long.

Nilbog of the Wizards Community forums.

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It is a rather aggressive carnivore, and not particularly intelligent, but it will not attack large, well-armed parties. Lone humanoids or even small groups
might well be attacked, though.

Ornithosuchus
Size/Type	Large animal
Hit Dice	5d8+20 (44 hp)
Initiative	+4
Speed	40 ft. (8 squares)
Armor Class	14 (-1 size, +5 natural)
Base Attack/Grapple	+3/+12
Attack	Bite +8 melee (1d8+7)
Full Attack	Bite +8 melee (1d8+7)
Space/Reach	10 ft./10 ft.
Special Attacks	—
Special Qualities	Low-Light Vision, Scent
Saves	Fort +8, Ref +4, Will +1
Abilities	Strength 20, Dexterity 10, Constitution 18, Intelligence 1, Wisdom 11, Charisma 5
Skills	Listen +4, Spot +4
Feats	Improved Initiative, Run, Weapon Focus (bite)
Environment	Warm plains or hills
Organization	Solitary or pair
Challenge Rating	3
Treasure	None
Alignment	Always neutral
Advancement	6-10 HD (Large), 11-15 HD (Huge)