Dwarf Fortress Bug Tracker - Dwarf Fortress
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0006117Dwarf FortressCreaturespublic2012-07-21 08:322014-07-23 10:11
Toady One 
normalminorhave not tried
0006117: Vermin can only escape from artifact animal traps
Part of the logic for vermin attempting to escape from animal traps includes a check against whether or not the animal trap is an artifact. This check appears to be backwards, however - as a result, a trapped vermin can only escape from an artifact animal trap, and a non-artifact trap will be able to safely contain any type of vermin.

This bug appears to date back to at least version (which is where I initially found it).
binary patch
related to 0006343resolved Toady One Caravans brings small animals/vermin that immediately escape their cages 
Issue History
2012-07-21 08:32QuietustNew Issue
2012-07-21 09:16QuietustNote Added: 0023308
2012-07-21 09:25QuietustNote Edited: 0023308bug_revision_view_page.php?bugnote_id=0023308#r8691
2012-07-21 09:25ab9rfNote Added: 0023309
2012-07-21 09:37QuietustNote Added: 0023310
2012-07-21 09:38QuietustTag Attached: binary patch
2012-07-21 10:04QuietustNote Edited: 0023310bug_revision_view_page.php?bugnote_id=0023310#r8693
2012-07-21 10:06QuietustNote Edited: 0023308bug_revision_view_page.php?bugnote_id=0023308#r8694
2012-07-21 10:08QuietustNote Added: 0023312
2012-08-08 14:15ab9rfNote Added: 0023430
2013-06-22 23:53DwarfuRelationship addedparent of 0006343
2014-01-15 14:49Kirig Stonebeard IIIssue Monitored: Kirig Stonebeard II
2014-01-17 10:03Kirig StonebeardIssue Monitored: Kirig Stonebeard
2014-03-25 13:13DwarfuAssigned To => Dwarfu
2014-03-25 13:13DwarfuStatusnew => acknowledged
2014-07-23 10:10Toady OneRelationship replacedrelated to 0006343
2014-07-23 10:11Toady OneStatusacknowledged => resolved
2014-07-23 10:11Toady OneFixed in Version => Next Version
2014-07-23 10:11Toady OneResolutionopen => fixed
2014-07-23 10:11Toady OneAssigned ToDwarfu => Toady One

2012-07-21 09:16   
(edited on: 2012-07-21 10:06)
This applies to all types of containers - in Fortress mode it's only animal traps and cages, while in Adventurer mode it also includes backpacks, quivers, waterskins, bags, barrels, and any other type of container you might find.

2012-07-21 09:25   
I can confirm that this happens with cages; I recently had a half dozen small tame creatures escape from an artifact cage immediately upon being placed within it. I have, otherwise, never had a tame creature escape from confinement.
2012-07-21 09:37   
(edited on: 2012-07-21 10:04)
The following binary patch fixes this problem in Win32 v0.34.11 SDL:
0x329E14 : 00 -> 01

2012-07-21 10:08   
This patch could lead to hilarity with Elven caravans - they bring all sorts of vermin in wooden cages, and any with [GNAWER] would immediately escape upon arrival.
2012-08-08 14:15   
I can confirm Quietust's prediction of hilarity: gnawing vermin brought by elven caravans escape immediately upon the caravan's entry, with this patch in place.