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[Button]

I'm set up in an Untamed Wilds tundra.

I knew you could die from exposure, but I didn't expect exposure to cold to make you bleed out... You bleed out from burning because your fat melts, so if you die from exposure to cold - what's causing the bleeding? I never seem to be able to catch anyone that's been partially damaged, and there's nothing in the combat logs.

Can anyone confirm that this is what hypothermia looks like?

The only victims so far have been stoats, weasels, a dog, and a 4-5 dwarves. I've only had a couple of these die while actually outside - most of them have made it indoors before they even start bleeding out. The longest blood trail I've seen from Sudden Onset Entryway Hemorrhage was only 4 tiles! My peregrine falcons stay outside most of the time and haven't had any problems, nor have any traders, invaders, or wild animals that I've seen, including wild stoats and weasels.

The corpses, on investigation, have no substance coverings except the blood of the deceased, occasionally pus (which may easily be unrelated/from previous infections), and occasionally snow.

I have not been visited by any titans, nor have any forgotten beasts made it to the surface. I did have one forgotten beast with dust that caused fever & rapid bleeding out, but it was very fast-acting and so it was contained to the small area of the cavern near where it died. I also have two dwarven bathtubs set up between that cavern and the main fortress, one of which is self-cleaning, so I seriously doubt it's FB-related.

Does anyone have some light to shed on this?

[Telgin]

I'm not positive on hypothermia causing bleeding, but it seems plausible given how fire damage works.

I'm pretty sure that wild animals (and probably anything not belonging to your fort) aren't affected by cold though, so that would explain why they aren't being frozen to death.

[Trif]

I did a small test fortress with seven dwarfs on a glacier, and after half a year of standing around and sleeping on ice, everyone is still completely fine.

DF doesn't seem to simulate hypothermia (yet). You've got a syndrome going on.

[Girlinhat]

Wild animals react to heat.  See: Magma.  If your beardmen are standing around on a glacier, confirm that you have temperature enabled first of all, then consult their clothing and whatnot.

But I'm fairly sure that the wild animals on the frozen areas are just used to living in cold - hence they live there.

[Zealord]

So...It's not possible to make a fortress in a freezing biome and kill goblin ambushes by locking them out in the cold?

Your settlement has been abandoned.

[Sutremaine]

Not with the default temperature range. You can get sites that are dangerously hot or cold, but nobody will come to trade with you. You can get around this by embarking on a site with at least two biomes, at least one of which is at a safe temperature.

It really does sound like syndrome death, especially since you've had an FB with a bleeding syndrome. Have you gone to the area where the bleeding starts and loo(k)ed around thoroughly?

[Tevish Szat]

death by hypothermia registers as "Unit has frozen to death" if observed -- I found this out while arena testing creatures that, for a bit, had Homeotherm: 1 (and were made of material that had a fixed temp of 1).  When given dwarves to fight, they usually strangled to death, but some dwarves succumbed to the sub-absolute-zero cold first.

No bleeding from hypothermia.  Sounds like there's probably a patch of syndrome-contaminant somewhere.  If the dwarves are infected and waiting for onset, I don't think washing off the contaminant in a dwarven bathtub does anything except remove the evidence.  Is there even as much as a tile of Evil on your map?

[Naryar]

No bleeding from hypothermia indeed, it just reports dwarves as frost-bitten. It seems to inflict a yellow injury to all affected bodyparts.

Then your dwarf freezes to death.

[Shoruke]

Dwarves don't usually have pus randomly, right?
If there's pus on a corpse, they probably have a syndrome going on.
I think you just need to airtight-ify the area around that FB more.

[Quietust]

If there's pus on a corpse, they probably have a syndrome going on.

Pus on individual body parts can be caused by infections, but pus covering the entire body is most likely caused by the "oozing" creature interaction effect (i.e. a syndrome).

[Button]

Thanks to those of you who have confirmed hypothermia doesn't cause bleeding. It must be a syndrome, though the physical distribution of the cases as only in the entryway of the fort remains very odd. If it were just a syndrome with a long incubation time, I'd expect it to strike in the more well-frequented parts of the fort, not only in the entryway (my dwarves only go outside to harvest goblinite).

Maybe I accidentally unforbid a bolt with some syndrome on, and it got on the snow out there?

I'm inclined to think the pus on the bodies of the bled-out is a red herring, since it occurs on less than half of the victims. On the other hand, as you say, the dwarven bathtubs may be washing away the evidence...

EDIT: Crap, found it. There is indeed a pool of forgotten beast extract in the middle of the entryway... don't know how I missed it before. Considering no forgotten beasts have been up there, I can only guess that it was indeed carried on a bolt.