Minecraft – How to delete/disable only certain types of mobs in the bukkit server

This particular mod was designed for vanilla, offline Minecraft, so you aren't able to install it onto a Bukkit Server. However, had it been a Bukkit-compatible mod, you would download the files of the mod. Sometimes, you are provided with only a .jar file (ex. SomeBukkitMod.jar) – other times you are given a .zip containing a .jar and also a directory with the name of the mod containing preference files. Whichever you're given, put the files in the /plugins directory of your Bukkit Server.

Despite this, it seems a Minecraft Forums user by the name of krnlyng has ported a few vanilla Minecraft server mods over to Bukkit, including BuildCraft. This thread is linked to from the official BuildCraft thread so I'm assuming it's reliable; at the time of writing, though, it's only compatible with 1.7.3.

The Minecraft Wiki has a table of common and rare drops for mobs. None them seem to drop beds, and I've certainly never heard of such a thing happening either. I suspect you just managed to pick one up from somewhere without noticing.