In my survival single player world it seems like I am experiencing some horse spawning issues (This map was created in 1.2.5). I loaded new chunks on this map and searched a few plains biomes, but couldn't find any horses.
Other mobs generate in my world that have been added since 1.2.5 (Like, wither skeletons). I don't know if this is a bug or a problem, or if I don't understand the horse spawning mechanics.
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So just for clarification: I got a 1.5.x world on my smp server which is limited by borders (no new chunks possible).
Possible that horses are spawning in this world?
You need to do a lot of exploring.