[happygrl]

I've been told that about cougars; they can sound like humans.

Javalinas, I've never heard.

[wolfcreek]

Javelinas make a horrible sound and have been know to attack humans. (in/out of the tents.) Not sure if they exist as far north as the Grand Canyon. (but close) http://www.azgfd.gov/h_f/game_javelina.shtml

[Towed_Jumper]

“Javalinas, I've never heard.”

Javelina bark like dogs...they also “click” their tusks when they're nervous or PO’d— all of them except for the one I have hanging in my office...he doesn't say much anymore...just hangs there with a snarling look on his face. (Killed him while handgun hunting in the desert).
I've spent my LIFE hunting/camping in both the deserts of Arizona and up on the Rim...I've never seen or heard of the Mogollon Monster.

My guess though, if they are about...say, 600-800 pounds, then a .30-06 with 180-gr JSP should bring them down no problem. I think I'll save a spot on my hunting trophy wall...just in case!