So, to summarize what we have so far, plus a few additions (mostly copied from lizardfolk):
Alcor
Medium Humanoid (Reptilian)
HD: 3d8+3 (16 hp)
Initiative: +2
Speed: 25 ft (5 squares)
AC: 15 (+2 Dex, +3 natural), touch 12, flat-footed 13
Base Attack/Grapple: +2/+3
Attack: Tail slap +4 melee (3d4+1); or spear +3 melee (1d8+1/x3); or dart +4 ranged (1d4+1)
Full Attack: Tail slap +4 melee (3d4+1); or 2 claws +4 melee (1d3+1) and 1 bite +2 melee (1d4); or spear +3 melee (1d8+1/x3); or dart +4 ranged (1d4+1)
Space/Reach: 5 ft/5 ft
Special Attacks: Downhill charge, tail sweep
Special Qualities: Arctic adaptation, skiing
Saves: Fort +2 Ref +5 Will +1
Abilities: Str 13 Dex 15 Con 13 Int 4 Wis 10 Cha 10
Skills: Balance +8 (6 ranks, +2 Dex, and any racial bonus we give it)
Feats: Multiattack, Weapon Finesse
Environment: Any cold land
Organization: Solitary, pair, or band (2-8)
Challenge Rating: X
Treasure: 50% coins; 50% goods; 50% items
Alignment: Usually neutral
Advancement: By character class
Level Adjustment: +X
COMBAT
Downhill Charge (Ex): When an alcor makes a charge while skiing downhill, its attack deals double damage in addition to the normal benefits and hazards of a charge.
Tail Sweep (Ex): This special attack allows an alcor to sweep with its tail as a standard action. The sweep affects a half-circle with a radius of 5 feet, extending from an intersection on the edge of the alcor’s space in any direction. Creatures within the swept area are affected if they are Large or smaller. A tail sweep allows for a Trip Attack without provoking an attack of opportunity. Rather than making an opposed Strength check, any affected creatures can attempt a Reflex save to avoid the Trip (DC 11). Successfully avoiding the Trip does not allow for the opponent to make a Trip Attack of their own.
Arctic Adaptation (Ex): An alcor does not need to make Fortitude saves to avoid taking nonlethal damage in conditions between 40 degrees and -20 degrees. In conditions of extreme cold (below -20 degrees) they must Fortitude saves like any other creature, but gain a +4 racial bonus on this save.
Skiing (Ex): By balancing itself on its large, flat tail, the alcor can glide rapidly across snow and ice while moving downhill. It can move as a run (x4) on slight grades (less than 45 degrees) or as a run (x5) on severe grades (45 degrees or more).
Skills: Alcors receive a +X racial bonus on Balance checks.
Originally found in Dragon Magazine #101 ("Creature Catalog III," September 1985, Michael Persinger).