uncommon n large animal 

Perception +17; bonesense (imprecise) 30 feet, darkvision

Skills Acrobatics +19, Athletics +15, Stealth +15

Str +4 Dex +6 Con +4 Int -5 Wis +2 Cha -5

Bonesense A giant bone skipper identifies bones and creatures with a skeletal system in the listed range.

AC  25; Fort +15, Ref +17, Will +15

HP 115

Speed 25 feet, fly 40 feet

Melee [>] mandibles +18, Damage 2d10+6 piercing plus marrow rot

Leaping Charge [>] The giant bone skipper Leaps up to 20 feet. It then makes a mandibles Strike, gaining a +1 circumstance bonus to its attack roll.

Marrow Rot As bone skipper swarm, but DC 25.

AoE2, page 80.