I was browsing the raw files, and I noticed that while manes are specifically referenced by several text references to lions, they do not in fact HAVE manes, so I went ahead and added them (which turned out to be slightly nontrivial). In addition, I went ahead and changed giant lions so that they, too, will have manes (using creature variations). I also created a white lion caste (both male and female) and added some more color variations for the default lions.
Lions:[CREATURE:LION]
[DESCRIPTION:A large ferocious predator found in grasslands. It lives in groups of females and one male with a large mane. They hunt together and are capable of felling extremely large prey.]
[NAME:lion:lions:lion]
[CHILD:3][GENERAL_CHILD_NAME:lion cub:lion cubs]
[CREATURE_TILE:'L'][COLOR:6:0:1]
[PETVALUE:200]
[PET_EXOTIC]
[MOUNT_EXOTIC]
[TRAINABLE]
[BIOME:SAVANNA_TROPICAL]
[BIOME:GRASSLAND_TROPICAL]
[BIOME:SHRUBLAND_TROPICAL]
[LARGE_ROAMING][FREQUENCY:5]
[POPULATION_NUMBER:5:10]
[CLUSTER_NUMBER:1:3]
[CARNIVORE][NATURAL]
[LARGE_PREDATOR][MEANDERER]
[GRASSTRAMPLE:0]
[PREFSTRING:roars]
[BODY:QUADRUPED:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:5TOES_FQ:4TOES_RQ:MOUTH:GENERIC_TEETH_WITH_LARGE_EYE_TEETH:RIBCAGE]
[BODYGLOSS:PAW]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SKIN:FAT:MUSCLE:BONE:CARTILAGE]
[BODY_DETAIL_PLAN:BODY_HAIR_TISSUE_LAYERS:HAIR]
[BODY_DETAIL_PLAN:HEAD_HAIR_TISSUE_LAYERS]
[BODY_DETAIL_PLAN:FACIAL_HAIR_TISSUE_LAYERS]
[BODY_DETAIL_PLAN:FACIAL_HAIR_TISSUES]
[USE_MATERIAL_TEMPLATE:CLAW:NAIL_TEMPLATE]
[USE_TISSUE_TEMPLATE:CLAW:CLAW_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:TOE:CLAW:FRONT]
[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:0:0:20000]
[BODY_SIZE:1:0:100000]
[BODY_SIZE:2:0:200000]
[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:10:20]
[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_PRIORITY:MAIN]
[ATTACK_FLAG_CANLATCH]
[ATTACK:SCRATCH:CHILD_TISSUE_LAYER_GROUP:BY_TYPE:STANCE:BY_CATEGORY:ALL:CLAW]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:scratch:scratches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:MAIN]
[DIURNAL]
[HOMEOTHERM:10067]
[SWIMS_INNATE][SWIM_SPEED:2500]
[MUNDANE]
[CASTE:FEMALE]
[FEMALE]
[CASTE_NAME:lion:lions:lion]
[POP_RATIO:95]
[CASTE:MALE]
[MALE]
[CASTE_NAME:lion:lions:lion]
[POP_RATIO:95]
[SET_TL_GROUP:BY_CATEGORY:HEAD:HAIR]
[PLUS_TL_GROUP:BY_CATEGORY:HEAD:CHEEK_WHISKERS]
[PLUS_TL_GROUP:BY_CATEGORY:HEAD:CHIN_WHISKERS]
[PLUS_TL_GROUP:BY_CATEGORY:HEAD:SIDEBURNS]
[TL_COLOR_MODIFIER:TAN:25:AMBER:1:AUBURN:1:BUFF:1:BURNT_SIENNA:1:BURNT_UMBER:1:CHESTNUT:1:CHOCOLATE:1:CINNAMON:1:COPPER:1:DARK_TAN:1:FLAX:1:GOLD:1:GOLDEN_YELLOW:1:GOLDENROD:1:LIGHT_BROWN:1:MAHOGANY:1:OCHRE:1:PALE_BROWN:1:PALE_CHESTNUT:1:RAW_UMBER:1:RUSSET:1:SAFFRON:1:SEPIA:1:TAUPE_PALE:1:TAUPE_SANDY:1]
[TLCM_NOUN:mane:SINGULAR]
[TISSUE_LAYER_APPEARANCE_MODIFIER:LENGTH:0:0:0:0:0:0:0]
[APP_MOD_NOUN:mane:SINGULAR]
[APP_MOD_RATE:1:DAILY:0:1000:0:0:NO_END]
[TISSUE_LAYER_APPEARANCE_MODIFIER:DENSE:50:80:90:100:150:200:250]
[APP_MOD_NOUN:mane:SINGULAR]
[CASTE:FEMALE_WHITE]
[FEMALE]
[CASTE_NAME:white lion:white lions:white lion]
[POP_RATIO:5]
[CASTE_COLOR:7:0:1]
[CASTE:MALE_WHITE]
[MALE]
[CASTE_NAME:white lion:white lions:white lion]
[POP_RATIO:5]
[CASTE_COLOR:7:0:1]
[SET_TL_GROUP:BY_CATEGORY:HEAD:HAIR]
[PLUS_TL_GROUP:BY_CATEGORY:HEAD:CHEEK_WHISKERS]
[PLUS_TL_GROUP:BY_CATEGORY:HEAD:CHIN_WHISKERS]
[PLUS_TL_GROUP:BY_CATEGORY:HEAD:SIDEBURNS]
[TL_COLOR_MODIFIER:WHITE:1:IVORY:1]
[TLCM_NOUN:mane:SINGULAR]
[TISSUE_LAYER_APPEARANCE_MODIFIER:LENGTH:0:0:0:0:0:0:0]
[APP_MOD_NOUN:mane:SINGULAR]
[APP_MOD_RATE:1:DAILY:0:1000:0:0:NO_END]
[TISSUE_LAYER_APPEARANCE_MODIFIER:DENSE:50:80:90:100:150:200:250]
[APP_MOD_NOUN:mane:SINGULAR]
[SELECT_CASTE:MALE_WHITE]
[SELECT_ADDITIONAL_CASTE:FEMALE_WHITE]
[SET_TL_GROUP:BY_CATEGORY:ALL:HAIR]
[TL_COLOR_MODIFIER:WHITE:1:IVORY:1]
[TLCM_NOUN:hair:SINGULAR]
[SELECT_CASTE:MALE]
[SELECT_ADDITIONAL_CASTE:FEMALE]
[SET_TL_GROUP:BY_CATEGORY:ALL:HAIR]
[TL_COLOR_MODIFIER:TAN:25:AMBER:1:BUFF:1:DARK_TAN:1:FLAX:1:GOLD:1:GOLDEN_YELLOW:1:GOLDENROD:1:OCHRE:1:PALE_BROWN:1:RAW_UMBER:1:SAFFRON:1:TAUPE_PALE:1:WHITE:1]
[TLCM_NOUN:hair:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:HEAD:MOUSTACHE]
[SELECT_CASTE:ALL]
[TL_COLOR_MODIFIER:WHITE:1]
[TLCM_NOUN:whiskers:PLURAL]
[TISSUE_LAYER_APPEARANCE_MODIFIER:LENGTH:50:80:90:100:110:150:150]
[APP_MOD_NOUN:hair:SINGULAR]
[APP_MOD_RATE:1:DAILY:0:250:0:0:NO_END]
[APP_MOD_NOUN:whiskers:PLURAL]
[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:IRIS_EYE_YELLOW:100:IRIS_EYE_GOLD:100:]
[TLCM_NOUN:eyes:PLURAL]
[SELECT_MATERIAL:ALL]
[MULTIPLY_VALUE:3]
Giant Lions:[CREATURE:LION_GIANT]
[COPY_TAGS_FROM:LION]
[APPLY_CREATURE_VARIATION:GIANT]
[SELECT_MATERIAL:ALL]
[CV_REMOVE_TAG:MULTIPLY_VALUE]
[APPLY_CURRENT_CREATURE_VARIATION]
[GO_TO_END]
[SELECT_CASTE:MALE]
[CASTE_NAME:giant lion:giant lions:giant lion]
[SELECT_CASTE:FEMALE]
[CASTE_NAME:giant lion:giant lions:giant lion]
[SELECT_CASTE:MALE_WHITE]
[CASTE_NAME:giant white lion:giant white lions:giant white lion]
[SELECT_CASTE:FEMALE_WHITE]
[CASTE_NAME:giant white lion:giant white lions:giant white lion]
[SELECT_MATERIAL:ALL]
[MULTIPLY_VALUE:4]
[GO_TO_START]
[DESCRIPTION:A gigantic version of the feline predator. Its giant prides can be found in the wildest, most savage parts of the world.]
[NAME:giant lion:giant lions:giant lion]
[GENERAL_CHILD_NAME:giant lion cub:giant lion cubs]
[CREATURE_TILE:'L']
[PETVALUE:400]
[PET_EXOTIC]
I also noticed that goats had no beards, so I gave them chin whiskers.
Mountain Goats:[CREATURE:GOAT_MOUNTAIN]
[DESCRIPTION:A medium-sized herbivore that lives in the high mountains, able to navigate the slopes despite its hooved feet.]
[NAME:mountain goat:mountain goats:mountain goat]
[CASTE_NAME:mountain goat:mountain goats:mountain goat]
[GENERAL_CHILD_NAME:mountain goat kid:mountain goat kids]
[CREATURE_TILE:'g'][COLOR:7:0:1]
[PREFSTRING:beards]
[PREFSTRING:long horns]
[PREFSTRING:surefootedness]
[LARGE_ROAMING]
[POPULATION_NUMBER:15:30]
[CLUSTER_NUMBER:1:4]
[GRASSTRAMPLE:0]
[BIOME:MOUNTAIN]
[BENIGN][MEANDERER]
[PETVALUE:50]
[PET]
[BODY:QUADRUPED_HOOF:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:2HEAD_HORN:MOUTH:GENERIC_TEETH:RIBCAGE]
[NATURAL]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[USE_MATERIAL_TEMPLATE:HOOF:HOOF_TEMPLATE]
[USE_MATERIAL_TEMPLATE:HORN:HORN_TEMPLATE]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[SELECT_TISSUE:HAIR]
[INSULATION:200]
[USE_TISSUE_TEMPLATE:HOOF:HOOF_TEMPLATE]
[USE_TISSUE_TEMPLATE:HORN:HORN_TEMPLATE]
[USE_TISSUE_TEMPLATE:CHIN_WHISKERS:CHIN_WHISKERS_TEMPLATE]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SKIN:FAT:MUSCLE:BONE:CARTILAGE]
[BODY_DETAIL_PLAN:BODY_HAIR_TISSUE_LAYERS:HAIR]
[TISSUE_LAYER:BY_CATEGORY:HEAD:CHIN_WHISKERS:BOTTOM]
[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:0:0:5000]
[BODY_SIZE:1:0:10000]
[BODY_SIZE:2:0:50000]
[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:20:30]
[ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_FRONT]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_WITH]
[ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_REAR]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_WITH]
[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_PRIORITY:SECOND]
[ATTACK_FLAG_CANLATCH]
[CHILD:1]
[DIURNAL]
[HOMEOTHERM:10067]
[SWIMS_INNATE][SWIM_SPEED:2500]
[MUNDANE]
[CASTE:FEMALE]
[FEMALE]
[MULTIPLE_LITTER_RARE]
[CASTE:MALE]
[MALE]
[SELECT_CASTE:ALL]
[SET_TL_GROUP:BY_CATEGORY:ALL:HAIR]
[TL_COLOR_MODIFIER:WHITE:1]
[TLCM_NOUN:hair:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:HEAD:CHIN_WHISKERS]
[TL_COLOR_MODIFIER:WHITE:1]
[TLCM_NOUN:beard:SINGULAR]
[TISSUE_LAYER_APPEARANCE_MODIFIER:LENGTH:10:25:50:60:70:80:250]
[APP_MOD_NOUN:beard:SINGULAR]
[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]
Just replace the existing raw entries with these, and your next generated world will have lions and mountain goats with facial hair
Yes, I am aware that adding facial hair to animals is silly, but its dwarf fortress after all - facial hair
matters.