Struthiomimus
Large Animal
Hit Dice: 6d8+12 (39 hp)
Initiative: +3
Speed: 60ft (12 squares)
Armor Class: 15 (-1 size, +3 Dex, +3 natural), touch 12, flat-footed 12
Base Attack/Grapple: +4/+12
Attack: Kick +7 melee (1d8+4)
Full Attack: Kick +7 melee (1d8+4), bite +2 melee (1d6+2) and 2 claws +2 melee (1d3+3)
Space/Reach: 10ft/5ft
Special Qualities: Low-light vision, scent, sprint
Saves: Fort +7, Ref +8, Will +3
Abilities: Str 18, Dex 16, Con 15, Int 2, Wis 13, Cha 10
Skills: Hide +2*, Listen +6, Spot +6
Feats: Alertness, Endurance, Run
Environment: Warm plains
Organization: Solitary, pair or flock (4-7)
Challenge Rating: 4
Treasure: None
Alignment: Always neutral
Advancement: 7-12 HD (Large), 13-18 HD (Huge)
Level Adjustment: -
This reptilian biped resembles an ostrich with arms and a long tail. A layer of down coats the creature and its legs are muscular and long.
The struthiomimus is a fast omnivorous dinosaur.
A struthiomimus is about 4 feet tall at the shoulder and about 10 feet long. They live in small flocks of one or more families and eat just about anything. Their diets include, but are not limited to, berries, nuts, tubers, lizards, eggs and small mammals. It has been reported that they will attack and consume halflings, but this is probably just a rumor. They are hunted themselves by tyrannosaurs and dinonychuses, and so their speed is an asset in escaping being eaten as much as it is in catching prey.
Combat
A struthiomimus attacks with its powerful hind legs, its bite and its small claws, but is more likely to simply flee a confrontation using its great speed.
Sprint (Ex): Once per day, a struthiomimus can move at 10 times its normal speed (600ft). It generally uses this ability either on a charge or to flee.
Skills: A struthiomimus receives a +8 racial bonus on all Hide checks made in a plains environment.
I might want to give it uncanny dodge.