Ankylosaurus                Brachiosaurus                     Compsognathus
                                 Large Beast                   Gargantuan Beast                Tiny Beast

Hit Dice:                 9d10+27 (76 hp)            36d10+252 (450 hp)              � d10 (2 hp)
Initiative:               +0                                    +0                                          +5 (Dex)
Speed:                    30 ft                                 30 ft                                       30 ft
AC:                         25 (-1 size, +16 natural)  16 (-4 size, +10 natural)        17 (+2 size, +5 Dex)
Attacks:                  Club +10 melee                Kick +35 melee                     Bite +7 melee
Damage:                 Club 2d6+7                      Kick 3d6+18                          Bite 1d3-3
Face/Reach:            5 ft by 10 ft/5 ft              20 ft by 40 ft /10 ft                2 � ft by 2 � ft/0 ft
Special Attacks:     --                                     Trample                                  --
Special Qualities: Scent                                Scent                                      Scent
Saves:                   Fort +9, Ref +6, Will +4  Fort +27, Ref +20, Will +13  Fort +2, Ref +7, Will +1
Abilities:               Str 20, Dex 11, Con 17     Str 35, Dex 10, Con 25,          Str 4, Dex 20, Con 11,
                               Int 1, Wis 12, Cha 6          Int 1, Wis 12, Cha 6              Int 2,Wis 13, Cha 6
Skills:                  Listen +6, Spot+5             Listen +12, Spot +12            Hide +14,
                                                                                                                       Move Silently +7, Spot +2
Feats:                    --                                         --                                          Weapon Finesse (bite)
Climate/Terrain: Temperate/warm forest     Temperate/warm forest       Any warm or temperate
                              or plains                             or plains                                land
Organization:    Solitary or pair                   Solitary, pack (2-5),              Solitary, pack (2-7),
                                                                        or herd (6-25)                        or swarm (8-19)
Challenge Rating: 5                                     14                                          1/8
Treasure:  ------------------------------------------------None---------------------------------------------
Alignment:  ------------------------------------------Always neutral---------------------------------------
Advancement:  10-18 HD (Huge)                 37-40 HD (Gargantuan)        --
                                                                        41+ HD (Colossal)

Here is an expansion of the Dinosaur entry in the Monstrous Manual.

Ankylosaurus
Ankylosaurus is a heavily armored dinosaur, covered in thick bony plates.  Though slow and plodding this herbivore wields a unique weapon, a club like tail that it can swing at those predators daring enough to attack it.  It can measure up to 20 feet long and weigh several tons.

Combat
Too slow to evade most predators, an ankylosaurus uses its club tail to dissuade those not daunted by its thick armor.  With its massive strength, it can often cripple the large two legged carnivores, sentencing them to death by starvation.

Brachiosaurus
One of the largest dinosaurs, this creature lives like the modern giraffe, eating the buds and leaves of the trees.  Its head can easily reach 40 feet or more into the treetops.  The statistics above can be used for any of the brachiosaurids, many who were even larger.

Combat
Few creatures would even think of attacking a healthy brachiosaur, but those who do receive a powerful kick.  This is sufficient deterrent to most predators.  Smaller creatures have to worry about being accidentally (or deliberately) trampled upon.
  
Trample (Ex): A frightened or enraged brachiosaurus can run over creatures of Large size or smaller, dealing 4d8+12 damage (opponents who do not make attacks of opportunity can attempt a Reflex save DC 35 for half damage).

Compsognathus
One of the smallest dinosaurs, it is only the size of a chicken.  These bird like creature fed on small animals and insects.

Combat
Generally, this creature is not much of a combatant, at least with medium size or larger creatures. When it does attack it is with a sharp bite.  Sometimes packs of these creatures will form and attack larger creatures.
Dinosaurs (Part I)
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