The feral piggy is a true problem to the environment. They don't create the "unnatural trails" of the bison but uproot and till acres of wilderness.

The drought allowed the porcine patrol to venture to the side of the LaChua Trail.

Approximately 60-80 acres of the adjacent terrain has been rooted to a depth of 18-24 inches.

The fresh tilling of the soli destroys much of the native vegetation and presents an opportunity for "invasives" to take over.

Here's some additional information:

http://www.smithsonianmag.com/science-nature/A-Plague-of-Pigs-in-Texas.html

http://www.huffingtonpost.com/2011/01/07/feral-pigs-florida_n_805829.html

(links indicate the source of the information.)

Oh yeah! Hornady contributes some additional data:

Pig in photo: Bearing 170 degrees off LaChua Plaform Range 260 yards ( Goggle Earth!)

223 rem Hornady Vmax 40 gr.

100- +0.9" 200- 0.0" 300- -5.5"

308 Win. Hornady Superperformance 150 gr.

100- +1.5" 200- 0.0" 300- -6.9"

Adjust +1.5" for sound suppressed equipment