That's another thing to change. They should be crosskobolds.
Embarked on another cave. I'm determined to clear out one of these for a proper kobold dwelling. This is actually my third attempt - on the second try I managed to land on a cave that already had kobolds living in it. Sorry guys.
But number three doesn't have any undead wildlife or native kobs. Just a one-armed bronze colossus. Luckily the fisherkob managed to run across the map before being obliterated, so the camp might yet survive.
EDIT: Ah crap, here he comes.
EDIT: Well, the colossus just went back to his spawn point to chill out, so I left him be and went to business building a house. Then I made a coffin for the dead fisherkob. The cave has some giant rats in it, but they weren't near the entrance so I decided to be cute and put the tomb right under the colossus.
Turns out bronze colossi have ground penetrating radar. Didn't know that until he was chasing the hunter deep into the cave to paint the walls with him. Then he startled the crafter who was trying to inter the corpse, which in turn started a dwarf-like "must stockpile" reflex among the other kobs until I forbid the corpse. Even so, the colossus was hot on the trail of three kobs when he emerged from the cave.
Then, I don't know what happened, but I think a kobold knee-capped him. He's stuck in lying-down mode and moving slowly. Sensing weakness, I ordered the remaining five to battle (which combined with the two deaths sent everybody into unhappiness). They're still there now, pounding ineffectually on the colossus' bronze hide while he occasionally throws a punch at the one trained wrestler and misses.
EDIT: The colossus has yet to stand up, but he had two big advantages. First, he may have crap speed and aim, but he only has to connect once to completely mangle a bodypart. Second, he's made of bronze, and can't choke or tire.
It took a while, but he methodically pulverized the kobolds, who could only bruise him for a few moments at a time. Now the only one left is the axekob, who's stuck in a wrestling loop with the colossus choking him. They've been at it for ten minutes now, so I guess I'll have to abandon.