(HUDSON, N.Y.) – Just two weeks after releasing its latest album, Animal Joy, Austin-based indie-rock group Shearwater, an offshoot of critically acclaimed cult band Okkervil River, will perform at Club Helsinki on Sunday, February 26, 2012, at 8 p.m. Founded in 2001 by Okkervil River members Jonathan Meiburg and Will Sheff as an outlet for…