A taxidermied artwork of a squirrel entitled "Nutless" is displayed at a press preview of the new exhibition "Brain Activity" by British artist David Shrigley at The Hayward Gallery, Jan. 31, 2012, in London. (Jim Dyson/Getty Images)

A narrow-gauge railway makes its way through a snow-covered forest at the Harz National Park near Schierke, central Germany, Jan. 31, 2012. (Jens Schlueter/dapd/AP Photo)

Director of National Intelligence James Clapper testifies before the Senate Select Committee on Intelligence, Jan. 31, 2012, on Capitol Hill in Washington. (Win McNamee/Getty Images)

A man walks his dog near the Neris River in the Vilnius, Lithuania, Jan. 31, 2012, as morning temperatures plummeted to minus 9 degrees Fahrenheit. (Mindaugas Kulbis/AP Photo)

International Church of the Restoration parishioners mourn the loss of Pastor Jose Carmo Jr., his wife Adriana and their daughter Leticia Carmo who were killed Sunday in an Interstate 75 multi-vehicle crash in Florida, Jan. 30, 2012, in Marietta, Ga. (Mike Stewart/AP Photo)

Occupy DC protesters demonstrate inside of a tent, created by a draped tarp over the statue of Union General James McPherson in McPherson Square, Jan. 30, 2012, in Washington. (Brendan Hoffman/Getty Images)

A soldier stands guard among marijuana plants at an illegal plantation found during a military operation on Friday at the Culiacan Mountains, northern Mexico, Jan. 30, 2012. (Marco Ugarte/AP Photo)