85. Animals that normally don't migrate decide to do so. Horses, pigs, cattle, sheep, etc. They either migrate out of or into the region the PCs are located. This behavior may not neccesarily be tied to the PCs, although if they don't stay in one place very long, this can lead to some sticky situations.
*Hey, where did my cows go?*
+ Um, there next to that inn, over there. Where those strangers are staying +
* Cattle thieves! Lynch em!*
Edit: Feel free to edit out most of this post. Just use the migration line, if you like.