I cheated a screwed-up mooder back to sanity (reverted to beginning of year) - i'd totally failed to keep track of him while i was busy overseeing the clothesmaking effort and he went melancholy, probably for lack of unforbidden bones. It was all about the loss of a useful dwarf really - it was an engraving mood, and a possession, too. I had already lost two dwarfs recently to a hunting mishap; it probably wasn't such a bright idea to let the only married female dwarf in the entire fort act as sole hunter on a savage embark. She kept going quite a while, but eventually, the wildlife caught up with her, in the shape of an angry giant hyena. And since her youngest child was only four months old, the second death was inevitable.
I finally, at long last, managed to purge the infestation of gigantic tortoises from the map: they just squat down and become completely invulnerable when attacked. The annoying thing is that some of the more aggressive tame animals, notably dogs, will sit on top of the tortoise and attack it for years on end. I eventually built cage traps all around the beasts, then ordered the dog slaughtered (and revoked the order after the dog got moved). The tortoise would then stumble into one of the traps and could be tamed and butchered. I also used them to kick-start my citizen militia, they're all adequate to skilled with crossbows now.