I've mostly been going through the bird raws so far since they were the biggest offenders. 90% of the entries were just [PREFSTRING:coloration]. I also took a stab at the creature_domestic file but it needs another pass. Some random examples below:
[CREATURE:BIRD_CARDINAL]
[PREFSTRING:striking red plumage]
[PREFSTRING:pronounced crest]
[PREFSTRING:song-learning ability]
[CREATURE:BIRD_KIWI]
[PREFSTRING:long beaks](vanilla)
[PREFSTRING:shyness]
[PREFSTRING:brown feathers]
[CREATURE:BIRD_GRACKLE]
[PREFSTRING:harsh, raucous calls]
[PREFSTRING:iridescent black plumage]
[PREFSTRING:cacophony]
[CREATURE:BIRD_CROW]
[PREFSTRING:intelligence](vanilla)
[PREFSTRING:iridescent black feathers]
[PREFSTRING:cunning]
[CREATURE:BIRD_OWL_BARN]
[PREFSTRING:pale face]
[PREFSTRING:screeching call]
[PREFSTRING:ability to rotate its head]
[CREATURE:DOG]
[PREFSTRING:loyalty](vanilla)
[PREFSTRING:playfulness]
[PREFSTRING:wet tongues]
[CREATURE:CAT]
[PREFSTRING:aloofness](vanilla)
[PREFSTRING:curiosity]
[PREFSTRING:purring]
[CREATURE:WATER_BUFFALO]
[PREFSTRING:water wallowing](vanilla)
[PREFSTRING:long horns]
[PREFSTRING:dark black skin]
My aim is to have 3 PREFSTRINGs for each animal, and to reword/replace things that feel very copy-paste or placeholder. For the birds, oftentimes I'd see a dwarf prefer one for their coloration, but have no idea what that color actually was since there wouldn't be a live one to inspect. I'm trying to give the birds something that lets you know what they look like, or gives them personality. For the domestic creatures, I'm focusing more on traits and characteristics since they're more diverse in specific looks, and most people know what those animals look like.
I'm working on this for my own little personal mod, but because I like to tinker with lots of different things in the creature raws, just wanted to know if you'd like me to keep a clean branch of it for MM. =)