"B" is for "Barkrunner"

Barkrunner

No. Enc.:  0 (2d4)
Alignment:  Neutral
Movement:  195' (65') 
Armor Class:  3
Hit Dice:  3
Attacks:  1d4+1 (kicks)
Damage:  1d6 per kick
Save:  L2
Morale:  8
Hoard Class:  None
XP:  95

Stalking grasslands and open plains, barkrunners are gangly, multi-legged creatures that stand 8'-12' tall.  They attack in simple and brutal fashion—they chase down prey, and then stomp it to death.  Once a barkrunner has made a kill, it straddles the corpse like a hen does an egg and uses the "roots" on its underbelly to lap up the nutritive mash.

Their thick hides make excellent armor and barding.  And powder made from grinding a barkrunner's flowery growths provides the Quickness Physical Mutation for 1d4 hours...but at the cost of gaining the Reduced Oxygen Efficiency Disability for the same duration.

Mutations:  Animal Limbs (Legs), Free Movement