Converting prehistoric animals

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Yeah, let's move on.

Iguanodon
Huge Animal
Hit Dice: 6d8+24 (51 hp)
Initiative: +0
Speed: 30ft (6 squares)
Armor Class: 12 (-2 size, +4 natural), touch 8, flat-footed 12
Base Attack/Grapple: +4/+19
Attack: Thumb-spike +9 melee (2d6+7)
Full Attack: 2 thumb-spikes +9 melee (2d6+7)
Space/Reach: 15ft/10ft
Special Attacks: Trample 2d8+10
Special Qualities: Low-light vision, scent
Saves: Fort +11, Ref +5, Will +3
Abilities: Str 24, Dex 10, Con 19, Int 1, Wis 12, Cha 7
Skills: Listen +7, Spot +8
Feats: Alertness, Great Fortitude, Run
Environment: Warm forests and plains
Organization: Herd (3-18)
Challenge Rating: 4
Treasure: None
Alignment: Always neutral
Advancement: 7-12 HD (Huge), 13-18 HD (Gargantuan)
Level Adjustment: -

This large creature is a quadruped, but looks capable of walking on its hind legs. Its head is large, broad and beaked, and its tail is tall and straight. Most noticeable are its hands, with their prehensile fifth finger, mitten like middle fingers and a thumb with a massive spike on the nail.

The iguanodon is an adaptable and common herbivorous dinosaur.

Most iguanodons are around 30 feet in length, although they do get bigger. They live in herds and are extraordinarily fecund for a creature of its size- one female can have as many as 10 young in one brood, and the young are sexually mature by age 3. This is fortunate for the species, as many predators attack them.

Combat
Iguanodons are not aggressive, but are more than capable of using their thumb-spikes to defend themselves. If badly injured, they flee, often over their opponent.

Trample (Ex): An iguanodon can literally run over any creatures in its way that are of Large or smaller size. Creatures trampled must make a Reflex save (DC 20 half) or take 2d8+10 damage. The save DC is Strength based.


Looking back on it, I want to boost the natural armor a bit. Maybe replace Great Fortitude with Iron Will. Wikipedia suggests that it may not have been a herding species--do we want to keep the stuff about herds and being very fecund?
 

Agreed to increasing natural armor, swapping GF/IW. I can go either way on the herding/fecundity.

"The best-known species, I. bernissartensis, is estimated to have weighed about 3.08 tonnes (3.5 tons) on average"

That gives us an average weight to work in.

What to make of this?

"The legs were powerful, but not built for running, and there were three toes on each foot."

"The maximum speed of Iguanodon has been estimated at 24 km/h (14.9 mph),[71] which would have been as a biped; it would not have been able to gallop as a quadruped.[1]"
 

I say increase speed to 40 feet. I think we don't need to do anything special with the switch between bipedal and quadrupedal stances--after all, it can't make any attacks if it uses the run action anyway.
 




Personally, I think we're done.

The actual name of the creature is "temnodontosaurus". I have changed the spelling accordingly.

Temnodontosaurus
Huge Animal
Hit Dice: 10d8+40 (90 hp)
Initiative: +3
Speed: Swim 60ft (12 squares)
Armor Class: 16 (-2 size, +3 Dex, +5 natural), touch 11, flat-footed 13
Base Attack/Grapple: +7/+21
Attack: Bite +11 melee (4d4+9)
Full Attack: Bite +11 melee (4d4+9)
Space/Reach: 15ft/10ft
Special Qualities: Hold breath, low-light vision, scent
Saves: Fort +11, Ref +10, Will +6
Abilities: Str 22, Dex 17, Con 18, Int 2, Wis 16, Cha 9
Skills: Listen +9, Spot +21, Swim +15
Feats: Alertness, Dodge, Mobility, Spring Attack
Environment: Warm aquatic
Organization: Solitary, pair or pod (5-20)
Challenge Rating: 6
Treasure: None
Alignment: Always neutral
Advancement: 11-20 HD (Huge), 21-30 HD (Gargantuan)
Level Adjustment: -

This massive beast resembles a reptilian porpoise, only on a grander scale. Its long beak is lined with sharp conical teeth, and its four fins are well-muscled .Most notable are its eyes, which are the size of dinner plates.

Temnodontosaurus is among the largest of the icthyosaurs, a family of fish-like reptiles.

The average temnodontosaurus is 30 feet long. They are fast and intelligent creatures, with a well-developed social system. They have remarkably keen eyesight due to the size of the eye- proportionately, the largest in the animal kingdom. Temnodontosaurs, like all icthyosaurs, never leave the water; unlike other aquatic reptiles, icthyosaurs give birth to their offspring alive. Temnodontosaurs feed on fish, squid and ammonites, and are harmless to humanoids, despite their size and strength, unless they are attacked first.

Combat
Temnodontosaurs are mobile opponents, darting in and out of their foes reach in order to deliver sharp, powerful bites.

Hold Breath (Ex): A temnodontosaurus can hold its breath for a number of rounds equal to 6x its Constitution score.

Skills: A temnodontosaurus receives a +8 racial bonus to all Spot checks.

A temnodontosaurus has a +8 racial bonus on any Swim check to perform a special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.
 
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