Dinosaur, Elasmosaurus
Long-necked and long-tailed, this large, predatory reptile glides through the water on four powerful flippers.

Elamsmosaurus (CR 7; XP 3,200)
N Huge animal
Init +2; Senses low-light vision, scent; Perception +14
AC 20, touch 11, flat-footed 17
(+2 Dex, +1 dodge, +9 natural, –2 size)
hp 105 (10d8+60)
Fort +14, Ref +9, Will +6
Speed 20 ft., swim 50 ft.
Melee bite +13 (2d8+12)
Space 15 ft.; Reach 20 ft.
Str 26, Dex 15, Con 20, Int 2, Wis 13, Cha 9
Base Atk +7; CMB +17; CMD 30 (34 vs. trip)
Feats Dodge, Great Fortitude, Iron Will, Mobility, Toughness
Skills Perception +14, Swim +16
Environment aquatic
Organization solitary, pair, or school (3–6)
Treasure none

The sleek elasmosaurus is a long-necked, aquatic reptile. Although not technically a dinosaur, they and their kind are often found hunting in oceans and lakes in areas where dinosaurs are more common. You can create statistics for smaller, similar aquatic reptiles (such as the pleisosaurus) by applying the young simple template to the statistics presented above. An elasmosaurus is 45 feet long and weighs 4,000 pounds.

Elasmosaurus Companions
Starting Statistics: Size Medium; Speed 20 ft., swim 50 ft.; AC +2 natural armor; Attack bite (1d8); Ability Scores Str 10, Dex 18, Con 12, Int 2, Wis 13, Cha 9; Special Qualities low-light vision, scent.

4th-Level Advancement: Size Large; AC +3 natural armor; Attack bite (2d6); Ability Scores Str +8, Dex –2, Con +4.