Each eidolon has one of three base forms that determines its starting size, speed, AC, attacks, and ability scores. All natural attacks are made using the eidolon's full base attack bonus unless otherwise noted (such as in the case of secondary attacks). Eidolon attacks add the eidolon's Strength modifier to the damage roll, unless it is its only attack, in which case it adds 1-1/2 times its Strength modifier. These base forms also note any free evolutions that base form possesses. The bonuses from these free evolutions are already factored into the starting statistics.
Alternatively, any one of these base forms can be used to make a Small eidolon. If the eidolon is Small, it gains a +2 bonus to its Dexterity score. It also takes a –4 penalty to its Strength and a –2 penalty to its Constitution. It also gains a +1 size bonus to its AC and attack rolls, a –1 penalty to its CMB and CMD scores, a +2 bonus on its Fly skill checks, and a +4 bonus on its Stealth skill checks. Reduce the damage of all of its attacks by one step (1d6 becomes 1d4, 1d4 becomes 1d3). If this choice is made, the eidolon can be made Medium whenever the summoner can change the eidolon's evolution pool (which causes it to lose these modifiers for being Small).
 Aquatic
Source Ultimate Magic pg. 74
Starting Statistics: Size Medium; Speed: 20 ft., swim 40 ft.; AC: +4 natural armor; Saves: Fort (good), Ref (good), Will (bad); Attack: bite (1d6); Ability Scores: Str 16, Dex 12, Con 13, Int 7, Wis 10, Cha 11; Free Evolutions: bite, improved natural armor, gills, swim (2)
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AvianSource Cohorts and Companions pg. 9
Starting Statistics: Size Small/Medium (see below); Speed: 30 ft., fly 30 ft. (good); AC: +2 natural armor; Saves: Fort (bad), Ref (good), Will (good); Attack: 2 claws (1d3); Ability Scores: Str 12, Dex 16, Con 13, Int 7, Wis 10, Cha 11; Free Evolutions: claws, flight, limbs (legs)
Size: When summoned, an avian eidolon is Small unless it spends 2 points from its evolution pool. At 5th level, a Medium or larger avian eidolon's flight speed increases by 40 feet, as if it had 2 more points in the flight evolution.
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BipedSource Advanced Player's Guide pg. 60
Starting Statistics: Size Medium; Speed: 30 ft.; AC: +2 natural armor; Saves: Fort (good), Ref (bad), Will (good); Attack: 2 claws (1d4); Ability Scores: Str 16, Dex 12, Con 13, Int 7, Wis 10, Cha 11; Free Evolutions: claws, limbs (arms), limbs (legs)
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QuadrupedSource Advanced Player's Guide pg. 60
Starting Statistics: Size Medium; Speed: 40 ft.; AC: +2 natural armor; Saves: Fort (good), Ref (good), Will (bad); Attack: bite (1d6); Ability Scores: Str 14, Dex 14, Con 13, Int 7, Wis 10, Cha 11; Free Evolutions: bite, limbs (legs) (2)
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SerpentineSource Advanced Player's Guide pg. 60
Starting Statistics: Size Medium; Speed: 20 ft., climb 20 ft.; AC: +2 natural armor; Saves: Fort (bad), Ref (good), Will (good); Attack: bite (1d6), tail slap (1d6); Ability Scores: Str 12, Dex 16, Con 13, Int 7, Wis 10, Cha 11; Free Evolutions: bite, climb, reach (bite), tail, tail slap
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TauricSource Cohorts and Companions pg. 9
Starting Statistics: Size Small/Medium (see below); Speed: 40 ft.; AC: +2 natural armor; Saves: Fort (good), Ref (bad), Will (good); Attack: 2 claws (1d4); Ability Scores: Str 14, Dex 14, Con 13, Int 7, Wis 10, Cha 11; Free Evolutions: claws, limbs (arms), limbs (legs) (2)
Size: When summoned, a tauric eidolon is Small unless it spends 2 points from its evolution pool.
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