Dwarf Fortress Bug Tracker - Dwarf Fortress
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0007653Dwarf FortressCreaturespublic2014-07-26 19:242014-07-29 09:18
Toady One 
XPS L511Z LaptopWindows 7 Home Premium 64-bitSP1
0007653: Rattlesnakes and Copperheads missing [CHILD:x] tag, won't breed
Since both rattlesnakes and copperheads don't use eggs, they lack a [CHILD:x] tag to allow breeding in fortress mode. Also, copperheads are loading the body detail plan for leathery egg materials that aren't used.
Probable Quick Fix
related to 0005721resolved Footkerchief Rattlesnakes and copperheads do not lay eggs 
related to 0006206resolved Toady One GIANT creature variation does not add [CHILD:x] tag, giant sized vermin incapable of breeding 
related to 0005782resolved Toady One Crundles lack [CHILD] tag, eggs don't hatch 
related to 0007826resolved Toady One Babies/children born out of wedlock 
Issue History
2014-07-26 19:24DwarfuNew Issue
2014-07-26 19:24DwarfuStatusnew => assigned
2014-07-26 19:24DwarfuAssigned To => Dwarfu
2014-07-26 19:24DwarfuTag Attached: Probable Quick Fix
2014-07-26 19:25DwarfuRelationship addedrelated to 0005721
2014-07-26 19:26DwarfuRelationship addedrelated to 0006206
2014-07-26 19:26DwarfuRelationship addedrelated to 0005782
2014-07-28 14:35DwarfuStatusassigned => confirmed
2014-07-29 09:18Toady OneNote Added: 0027867
2014-07-29 09:18Toady OneStatusconfirmed => resolved
2014-07-29 09:18Toady OneFixed in Version => Next Version
2014-07-29 09:18Toady OneResolutionopen => fixed
2014-07-29 09:18Toady OneAssigned ToDwarfu => Toady One
2014-08-04 20:36DwarfuRelationship addedrelated to 0007826

Toady One   
2014-07-29 09:18   
I went ahead and removed the has_baby_state or has_child_state condition for all pregnancies, though they still require a male and female caste at this point.