If you ever want to see something REALLY cool try this.
Bore some holes in the ground under a tree, around the big roots and what not. Make sure to get the holes at least 18 to 24 inches deep and maybe as big around as a tennis ball. Make at least a dozen holes around the tree. Now, fill the holes with corn.
Come back in a few days and your tree should be on the ground. Those pigs will root all up under that tree to get the corn and the tree will fall. Sometimes it takes two or three rounds of filling holes with corn, but they will get the job done.