I made my first "permanent tap" of the first cavern, just as a giant cave spider scuttled by.
The plan is basically to leave a bait animal and door (and maybe my artifact tetrahedrite hatch when I have the time to make an FB trap) with some cages outside to catch some of the rambling predators and building destroyers.
Unfortunately, one of my miners got some farming experience somehow, and now will
abandon any mining project the instant a plant ripens, which meant that I was suddenly cut down from two to one miner on-duty. And naturally, dwarves being dwarves, the miner dwarf chose to run out into the unprotected caverns where a GCS had just been spotted to mine the other piece of wall.
lurking GCS
Sure, just go outside, why not?!
Fortunately, the spider went the long way around, as well, and overshot the closest route to the dwarf...
That's what you get!
So, I opened up the caverns for trapping and within a day, had a GCS to show for it.
Oh, and in other news, a troll picked a fight with a giant olm nearby a short time before this. An epic and long-running fight ensued, where the giant olm's tail was badly damaged, and much olm blood spread around, and the giant olm fainted from pain after having a leg hit to red damage, as well. The giant olm was helpless, as all it could do was bruise with its bites... And then the stupid troll kept charging the fainted olm until the troll fainted from overexertion, and the giant olm got some free bites in. This pattern continued for several weeks and several cycles of the troll using its charge attack until exhausted (the giant olm would frequently show preference for retreat over fighting back) until the giant olm got a lucky latch onto the throat of the troll.
Further proof the charge attack should be seriously reworked in AI...