Turn the volume UUUUUUP !
I was going over some video tapes (video trail camera) from last fall.
I didn't catch this the first time I watched it back then.
Was probably F/F because I didn't see anything on the screen.
It was/had been raining thats why it looks odd.
We have all heard this from the stand but I thought it was neat to get it on video or rather audio. LOL

http://i12.photobucket.com/albums/a231/silbowhunter/th_Grunt.jpg (http://s12.photobucket.com/albums/a231/silbowhunter/?action=view&current=Grunt.flv)

Very distinct, I love hearing that coming towards your stand. Great capture FL, and good ear for hearing it.