Dwarf Fortress Bug Tracker - Dwarf Fortress
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0001373Dwarf FortressWorld Generation -- Generalpublic2010-04-20 14:072012-04-06 08:01
Toady One 
0001373: Kobolds almost never generated on Island regions
Default island regions have significantly fewer caves than the old-style regions. As a result, mega and semi-megabeasts steal all the caves, leaving nowhere for the kobolds to spawn.

Doubling the amount of mountain caves generated seems to allow the kobolds to spawn normally.
Issue History
2010-04-20 14:07Lightning4New Issue
2010-04-20 14:13smjjamesNote Added: 0004381
2010-04-25 06:33Lightning4Tag Attached: worldgen
2012-04-06 08:01FootkerchiefNote Added: 0022128
2012-04-06 08:01FootkerchiefStatusnew => resolved
2012-04-06 08:01FootkerchiefFixed in Version => 0.34.01
2012-04-06 08:01FootkerchiefResolutionopen => fixed
2012-04-06 08:01FootkerchiefAssigned To => Toady One

2010-04-20 14:13   
I can confirm this too, just boost up the number of caves and kobold civs will get placed down.

As Lightning said, I believe this is because there are so many megabeasts and semi-megas and the fact that they get placed before civs do. If the megabeasts take over all the caves available, no cave civs (Kobolds that is) will get placed.

They can still get wiped out later in worldgen though.
2012-04-06 08:01   
Please reopen this report if the problem is still present in 0.34.02+.