Ichthyosaur

Ichthyosaurs were giant marine reptiles that resembled fish and dolphins. Ichthyosaurs lived during a large part of the Mesozoic era, having appeared about 250 million years ago. During the middle Triassic Period, ichthyosaurs evolved from as-yet unidentified land reptiles that moved back into the water, in a development parallel to that of modern-day dolphins and whales. They were particularly abundant in the Jurassic Period, until they were replaced as the top aquatic predators by plesiosaurs in the Cretaceous Period.

Originally Posted by Bhu of the Wizards Community forums.

On this Thread

Here’s the medium version of the Icthyosaur.

Icthyosaurus
Medium animal
Hit Dice	5d8+15 (37 hp)
Initiative	+4
Speed	Swim 50 ft. (10 squares)
Armor Class	18 (+4 Dexterity, +4 Natural), touch 14, flat-footed 14
Base Attack/Grapple	+3/+4
Attack	Bite +4 melee (1d6+2)
Full Attack	Bite +4 melee (1d6+2)
Space/Reach	5 ft./5 ft.
Special Attacks	–
Special Qualities	Hold Breath, Low Light Vision, Scent
Saves	Fort +7, Ref +8, Will +2
Abilities	Strength 12, Dexterity 19, Constitution 16, Intelligence 2, Wisdom 13, Charisma 9
Skills	Listen +6, Spot +6, Swim +9
Feats	Alertness, Swim-By Attack
Environment	Warm Aquatic
Organization	Solitary, Pair, or School (3-6)
Challenge Rating	2
Treasure	None
Alignment	Always Neutral
Advancement	6-9 HD (Medium)
Level Adjustment	—-