Brontosaurus (CR 11)

Gargantuan Animal
Alignment: Neutral
Initiative: +1 (Dex); Senses: scent, Listen +6, and Spot +6

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AC: 11 (+4 natural, -4 size, +1 Dex), touch 7, flat-footed 10
Hit Dice: 26d8+182 (308 hp)
Fort +22, Ref +15, Will +8

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Speed: 20 ft.
Space: 30 ft./15 ft.
Base Attack +19; Grapple +27
Attack: 1 bite +31 melee, 1 tail +27 melee
Full Attack: 1 bite +31 melee, 1 tail +27 melee
Damage: 2d8 +12 bite, 1d8 +12 tail
Special Attacks/Actions: Trample, capsize

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Abilities: Str 35, Dex 11, Con 25, Int 1, Wis 10, Cha 9
Special Qualities: immunities
Feats:
Skills: Listen +6 and Spot +6
Advancement: -

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Climate/Terrain: Prehistoric Aquatic
Organization: Solitary (1) or group (1-3)
Treasure/Possessions: None

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Source: Converted

Trample (Ex): A brontosaurus can trample Large-sized or smaller creatures for 2d8+12 points of damage if fighting on solid ground or in shallow water. Opponents who do not make attacks of opportunity against the brontosaurus may attempt a Reflex save (DC 20) for half damage.

Capsize (Ex): A submerged brontosaurus that surfaces under a boat or ship less than 20 feet long capsizes the vessel 95% of the time. It has a 50% chance to capsize a vessel from 20 to 30 feet long, and a 20% chance to capsize a vessel 30 to 60 feet long.

Immunities: A brontosaurus is immune to all disease and poisons that do not cause damage.