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Mastodon apparently isn't done twerking.  The metal act surprised many by filling their recent video for "The Motherload" with twerking women, but now they're inviting fans to embrace the rear-end-shaking dance.  They're giving away free concert tickets to a few lucky fans who post a photo or a video of their best twerk on the group's Facebook page. 

Mastodon is set to kick off the latest North American leg of their "Once More 'Round the Sun" tour Wednesday night in Boise, Idaho. 

Mastodon's North American tour dates: 

10/15/14 - Revolution Center (Boise, ID) 
10/16/14 - Grand Sierra Theatre (Reno, NV) 
10/17/14 - Fox Theatre (Pomona, CA) 
10/18/14 - Marquee Theatre (Tempe, AZ) 
10/20/14 - Stubb's Amphitheatre (Austin, TX) 
10/21/14 - Southside Music Hall (Dallas, TX) 
10/22/14 - Uptown Theater (Kansas City, MO) 
10/24/14 - The Fillmore (Detroit, MI) 
10/28/14 - State Theater (Portland, ME) 
10/29/14 - Metropolis (Montreal QC) 
10/30/14 - Lupo's (Providence, RI) 
10/31/14 - Paramount Theater (Huntington, NY) 
11/1/14 - Starland Ballroom (Sayerville, NJ) 
11/2/14 - Sherman Theater (Stroudsburg, PA) 
11/4/14 - Ram's Head Live (Baltimore, MD) 
11/5/14 - The International (Knoxville, TN) 
11/6/14 - Marathon Music Works (Nashville, TN) 
11/7/14 - Tabernacle (Atlanta, GA) 

Photo: Getty Images