Yup, they're working now.
EDIT:
17805 Chirps
120 Dretches
They're a bit lacking in numbers, though.
Generally, they make some fortresses, and the chirps move in, like this here:
6: Traitorbrewed, "Traitorsbrewed", fortress
Owner: The Pumpkin Lies, dretches
Parent Civ: The Loving Evils, dretches
lady: Frisig Heroiclovings, chirp
413 chirps
93 chirp prisoners
So most of the Dretch armies are made up of Chirp emigrants.
EDIT2:
[CARNIVORE], [NO_EAT] and [CLUTCH_SIZE:1:20] did the trick; they have about equal numbers now.
Now, if only we could get them to war now... No matter how horrible the Dretches are, they somehow never war.
I don't get it.
EDIT3:
Adventurer Hero Chirp.
Name: Sig Treasuresblack "the Red Fair Savages of Wall"
Went to a Dretch hillock.
They were attacked by bandits, so I moved near them when they ambushed me.
Shoot down all of them with a Meteoric Iron Thunder Stick with bullets from the same material, then bashed their torso in to finish them off.
The members of the hillock started attacking me, seeing me as a genocider Chirp. Which was not far from the truth, as I originally wanted to kill them all.
Took down the guards and the braver workers.
Most peasant were sitting near the walls, afraid of me.
I went up to the lord, claimed the site in the name of Teahills (and became the lady of Teahills) and then finished off the lord in the same way as I did to every other.
When suddenly, a farmer dretch got enough courage to oppose me, dodged two of my bullets (the first two times someone dodged my bullets in this life) and scored a lucky hit on me.
Died to the dretch venom.