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Quote from NickCrockett No pics no clicks
Quote from ion25 What he said.
Here's the link http://www.mediafire.com/?7dx0y6nw34xcbnw
It's to the right when you exit the house.
Edit: I checked it out, and it's too close to your house, pretty small, and you probably haven't cleared all the caves around the trap.
Edit2: Also, spiders might block other mobs, because the canals are only 1 block wide.
And, make your canals two blocks deep, like this:
Front view:
What he said.