Hi!
To understand this, you need to know that I like building above ground structures so as to avoid cave adaptation. Needless to say, after my first encounters with blood in the 31.01 version and the huge disruption the sea of blood in my surface bed rooms has cause, I have deliberately changed my fortress design to avoid any insoluble blood issues.
Now, while one of the armed caravans was in the depot in my young 31.03 fortress, a cougar strayed near them and got shot with a bolt. It moved away, trailing blood and finally bled to death quite a bit away from my fortress proper.
I checked on the cougar a few times in hope someone would butcher it, but in the end, I only got the bones and skull out of it.
Spring arrived, and I looked around the fortress also wishing to check on my fields which are one z-level above the entrance/trading area of the fortress (I got maybe 3 levels of rising terrain on the north of my map with a really nice "bay" in the middle) - and all I saw was red!
I had totally forgotten that I had not created a dining hall yet and the wagon was standing right next to a random murky pool. Someone or something must have gotten in contact with the cougar (probably when retrieving the bolt), washed themselves at that very pool - and all the animals and idle dwarves have multiplied it into a sea of blood!
I really goofed there, and I am not sure if I will get enough rain to clean up that mess there (^_^;;
Deathworks