I can't see anything, but here's the code:
[CREATURE:BISON]
[DESCRIPTION: A huge, powerful bovine with short, curved horns and a humped back. Great numbers of these beasts traverse the temperate plains.]
[NAME:bison:bison:bison]
[CASTE_NAME:bison:bison:bison]
[CREATURE_TILE:'B'][COLOR:6:0:0]
[BIOME:GRASSLAND_TEMPERATE]
[BIOME:SAVANNA_TEMPERATE]
[BIOME:SHRUBLAND_TEMPERATE]
[POPULATION_NUMBER:15:30][FREQUENCY:10]
[CLUSTER_NUMBER:3:7]
[PETVALUE:500]
[PREFSTRING:strength]
[LARGE_ROAMING]
[BENIGN][MEANDERER][PET_EXOTIC][TRAINABLE]
[VISION_ARC:50:310]
[STANDARD_GRAZER]
[BODY:QUADRUPED_NECK_HOOF:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:MOUTH:TONGUE:GENERIC_TEETH:RIBCAGE:2HEAD_HORN]
[NATURAL]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[USE_MATERIAL_TEMPLATE:HOOF:HOOF_TEMPLATE]
[USE_MATERIAL_TEMPLATE:HORN:HORN_TEMPLATE]
[SELECT_MATERIAL:HAIR]
[STATE_NAME:ALL_SOLID:fleece]
[STATE_ADJ:ALL_SOLID:fleece]
[YARN]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[USE_TISSUE_TEMPLATE:HOOF:HOOF_TEMPLATE]
[USE_TISSUE_TEMPLATE:HORN:HORN_TEMPLATE]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SKIN:FAT:MUSCLE:BONE:CARTILAGE]
[BODY_DETAIL_PLAN:BODY_HAIR_TISSUE_LAYERS:HAIR]
[SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]
[PLUS_TISSUE_LAYER:SKIN:BY_CATEGORY:THROAT]
[TL_MAJOR_ARTERIES]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[HAS_NERVES]
[USE_MATERIAL_TEMPLATE:BLOOD:BLOOD_TEMPLATE]
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
[CREATURE_CLASS:GENERAL_POISON]
[GETS_WOUND_INFECTIONS]
[GETS_INFECTIONS_FROM_ROT]
[USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
[PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
[BODY_SIZE:0:0:70000]
[BODY_SIZE:1:0:350000]
[BODY_SIZE:2:0:900000]
[BODY_APPEARANCE_MODIFIER:LENGTH:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[MAXAGE:10:25]
[ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_FRONT]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PREPARE_AND_RECOVER:4:4]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_WITH]
[ATTACK_FLAG_BAD_MULTIATTACK]
[ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_REAR]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PREPARE_AND_RECOVER:4:4]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_WITH]
[ATTACK_FLAG_BAD_MULTIATTACK]
[ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:bite:bites]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PREPARE_AND_RECOVER:3:3]
[ATTACK_PRIORITY:SECOND]
[ATTACK_FLAG_CANLATCH]
[ATTACK:HGORE:BODYPART:BY_CATEGORY:HORN]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:gore:gores]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PREPARE_AND_RECOVER:3:3]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:MAIN]
[DIURNAL]
[HOMEOTHERM:10068]
[APPLY_CREATURE_VARIATION:STANDARD_QUADRUPED_GAITS:900:711:521:293:1900:2900] 30 kph, NO DATA
[APPLY_CREATURE_VARIATION:STANDARD_SWIMMING_GAITS:9000:8900:8825:8775:9500:9900] 1 kph, NO DATA
[APPLY_CREATURE_VARIATION:STANDARD_CRAWLING_GAITS:9000:8900:8825:8775:9500:9900] 1 kph, NO DATA
[SWIMS_INNATE]
[TRADE_CAPACITY:1500]
[MUNDANE]
[CASTE:FEMALE]
[FEMALE]
[MULTIPLE_LITTER_RARE]
[CASTE:MALE]
[MALE]
[SET_BP_GROUP:BY_TYPE:LOWERBODY][BP_ADD_TYPE:GELDABLE]
[SELECT_CASTE:ALL]
[SET_TL_GROUP:BY_CATEGORY:ALL:HAIR]
[TL_COLOR_MODIFIER:BROWN:1]
[TLCM_NOUN:hair:SINGULAR]
[TISSUE_LAYER_APPEARANCE_MODIFIER:LENGTH:0:0:0:0:0:0:0]
[APP_MOD_NOUN:fleece:SINGULAR]
[APP_MOD_RATE:1:DAILY:0:300:0:0:NO_END]
[APP_MOD_DESC_RANGE:10:50:100:150:200:300]
[SHEARABLE_TISSUE_LAYER:LENGTH:300]
[SET_TL_GROUP:BY_CATEGORY:ALL:SKIN]
[TL_COLOR_MODIFIER:BROWN:1:BURNT_UMBER:1:CINNAMON:1:COPPER:1:DARK_BROWN:1:DARK_PEACH:1:DARK_TAN:1:ECRU:1:PALE_BROWN:1:PALE_CHESTNUT:1:PALE_PINK:1:PEACH:1:PINK:1:RAW_UMBER:1:SEPIA:1:TAN:1:TAUPE_PALE:1:TAUPE_SANDY:1]
[TLCM_NOUN:skin:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
[TL_COLOR_MODIFIER:BLACK:1]
[TLCM_NOUN:eyes:PLURAL]
[SELECT_MATERIAL:ALL]
[MULTIPLY_VALUE:3]
Perhaps it's the trade capacity without being a wagon puller?