Dwarves keeping bees and sheep and ducks is kind of silly. Those are humans' animals! Dwarves obviously need some nifty, cavern-dwelling, dwarven pets. So I made some.

The forum thread is here. Comments are greatly appreciated!

Contains:

Animals:

• Thidas bungek, the frill lizard (done): Small, vermin-hunting lizards with triceratops-like head frills that come in various colors. The rarer colors can be quite expensive and are almost never traded, in part because they (unlike the more common varieties) have a tendency to adopt dwarves. As if that wasn't complicated enough, baby frillies all start out with camouflaged grey scales, and their first color change may not be a reflection of their final color. Replace cats, partially replace poultry.
  
• Riril atem, the fellowship rat (done): In the wild, these smart, social, and extremely fluffy creatures band together to steal your food. Once domesticated, they provide wool, hunting assistance, and socialization opportunities for your dwarves. Replace sheep/llamas/alpacas, partially replace dogs, [CAN_LEARN] with innate social skills.
  
• Stetar fesh, the honey wing bat (done, subject to tweaking): Large, fruit-eating bats that give sweet milk, which can, after processing, be brewed to mead, as well as being able to be made into cheese. Their slow-growing hair is just long enough to shear yearly. Partially replaces bees, cows, and other milkable creatures. May be made to graze to simulate scavenging for fruit.
  
• Atol sethal, the truth spider (done): Physically fragile but quite fast and possessing a devastating poison, these giant daddy long leg spiders are a solid defense against large, solitary monsters of the deeps.
  
• Etur lanlar, the boulder bird (mostly done, needs grazer testing): A large, wingless bird with a nasty kick, kept for meat. Young of the species are known as ib lanlar, or pebble birds. Partially replaces cows, replaces poultry. May be a grazer if that doesn't make them unable to breed via eggs.
  
• Inrus vesrul, the poison worm (done): A war-trainable mass of clawed purple tentacles with a long tail for a body. This fast-breeding dog-sized creature exudes a numbing contact poison, which it can also be milked for; the poison can then be processed to make it more potent. (Due to limitations in how DF handles liquids, this poison is probably not usable - though there's certainly still room for !!science!!. Let us know if you figure out anything interesting!) Partially replaces dogs.
  
• Kadol ozsit, the gem crab (planned): Tiny land-dwelling crabs whose naturally gem-encrusted shells are prized for crafts. Rumor has it that occasionally, a clutch of gem crabs will produce a mutant which can grow to enormous sizes.
  
• Iteg lam, the tentacle stone, known to humans as cave coral (planned): These creatures are nearly immobile, encased in a shell of harvestable stone. They exist in several varieties, which have different kinds of stone for their shells and which do not interbreed. Some of the rarer ones can be harvested for metal ores, and these are exceptionally expensive and jealously guarded by the fortresses that are lucky enough to have them.

Reactions:

• Reduce liquid (done, subject to tweaking): Similar to boiling maple sap to make maple syrup, this reaction transforms a liquid into a thicker version of itself. Currently returns as much liquid as it takes, but should probably take twice as much as it returns in the final version. Currently used to reduce honey bats' honey milk into brewable milk honey, will be used to make concentrated poison worm poison and possibly other things.
  
• Denature poison (under consideration): Add a special herb to concentrated poison worm poison, to make it dwarf-safe. Probably pointless if the result can't be used.
  
• Make mead (done): The vanilla reaction will only brew honeybee mead. Rather than making a new reaction to brew milk honey, I modified the existing one to brew any kind of mead. This also unlocks bumblebee mead, which is specified in the vanilla raws.
  Note: This replaces the existing 'make mead' reaction, in reaction_other.

Plants:

• Some sort of rare herb to denature poison worm poison with. Probably otherwise quite generic. (Under consideration)

Custom body part:

• Head frill, for frill lizards.

Installation:
Download the file and unzip it into /raw/objects. It will try to overwrite the entity_default and reaction_other files. If this is the only mod you're using, allow it to do so. If you're using other mods which may have changed those files, you will need to manually edit them.

• In entity_default, find [PERMITTED_REACTION:ADAMANTINE_WAFERS] and add [PERMITTED_REACTION:REDUCE_LIQUID] on a new line after it.
• In reaction_other, find [REACTION:MAKE_MEAD]. Replace that reaction (that line, and all lines until you reach another line that starts with "[REACTION:" or the end of the file) with the following:
  Code:

  [REACTION:MAKE_MEAD] [NAME:make mead] [BUILDING:STILL:CUSTOM_M] [REAGENT:honey:150:LIQUID_MISC:NONE:CREATURE_MAT:NONE:HONEY] [HAS_MATERIAL_REACTION_PRODUCT:DRINK_MAT] [UNROTTEN] [REAGENT:honey container:1:NONE:NONE:NONE:NONE] [CONTAINS:honey] [PRESERVE_REAGENT] [DOES_NOT_DETERMINE_PRODUCT_AMOUNT] [REAGENT:barrel/pot:1:NONE:NONE:NONE:NONE] [EMPTY] [FOOD_STORAGE_CONTAINER] barrel or any non-absorbing tool with FOOD_STORAGE [PRESERVE_REAGENT] [DOES_NOT_DETERMINE_PRODUCT_AMOUNT] [PRODUCT:100:5:DRINK:NONE:GET_MATERIAL_FROM_REAGENT:honey:DRINK_MAT] [PRODUCT_TO_CONTAINER:barrel/pot] [PRODUCT_DIMENSION:150] [SKILL:BREWING]

Changelog:

v0.1: Frill lizards, fellowship rats, honey wing bats, truth spiders, reduction reaction, mead fix.

v0.2: Added poison worms, fixed truth spider venom typo.

v0.3: Added boulder birds, fixed natural skill errors in frill lizards and fellowship rats, added attributes and personality data to all creatures.

v0.3a: Re-added custom body file.

v0.4 (planned): Adjust body proportions and creature personalities/behavior; add cave coral.