Found out a lot about prolonged stress, the stages of stress and when to expect an individual to finally snap. Also found out that a creature throwing a tantrum is capable of destroying everything, be it a bridge it is standing on (over magma) or (steel) chains which hold it in place. And I found out that, no matter how much time given, a creature that went insane will not turn back sane, even if its stress levels go back to 0 - good thing that goblins are immortal, they make good long term test subjects.
By now my stress related test series has ended though, last thing I found out was that a berserk goblin will not leave the map, even if released topside.
Now I just do tests of how well Jabberers can dispose of unarmed, naked prioners of all kind. And I must say...they produce a lot of body parts that need to be dumped. Sadly my Jabberer army is currently in the phase of dying of old age though, soon I'll have to breed them again, whenever their number is below 50.
Hopefully at some point I'll get a male Roc...already got a female one.
Also did some vertical acceleration tests with invaders. It was a smashing success, taking up good speed at the start, but coming to a very sudden stop at the end.
The main problem was that somehow the test subjects kept getting free, so I had to abbandon this project for invaders and reserved it for cavern creatures only.
Another thing I had to look into was a cage-emptying-shotgun-system. Because of the beforementioned problem I needed a way to safely remove prisoners from cages, I found that launching them down several ramps in their cages in a minecart against a wall would cause not just the cages to be flung out of the minecart, but cause the cages to empty either upon hitting the wall, or during flight already.
That arena idea sounds interesting, but there's not much point to pit my legendary military against some puny goblins, trolls, elves, war grizzlies or such...I really prefer my Jabberers doing that job, and hopefully soon the Rocs to take over.
Sadly all Forgotten Beasts spawned down in that place below places, where beings creep around that are at least as scary, if not worse then themselves.
Really need some new ideas of what to do with all the damn invaders volunteers coming to my fortress. The last goblin and elf sieges I just shotgun-emptied into a meatgrinder room (filled with large serrated disk traps) down at magma flow level.