Made a single player world a lan, second player joined. Went to a desert and it was filled with pigs. They appeared to keep spawning. Due to performance with the amount of pigs I could not get a clear understanding of what was going on.
attached are screenshots, for what little use they may be
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This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded MineCraft.

Duplicate of MC-4061. Do you still have the world this occurred in?
Yes, I do.

Can you zip it up and attach it to the ticket, so that the Mojang can research this? This sort of bug has happened to a couple of people, but nobody's figured out a way to make it happen on demand, making it hard to determine the source of the bug.
The zip file is 25 mb, too large to upload here.
Edit: mediafire link to the world.
http://www.mediafire.com/?70imxo21i08p3ze