A male bison stands in an open-air cage at the Royev Ruchey zoo in Krasnoyarsk
A male bison stands in an open-air cage with the air temperature at about -34 degrees Celsius (-29.2 degrees Fahrenheit) at the Royev Ruchey zoo in Krasnoyarsk January 3, 2011. REUTERS/Ilya Naymushin (RUSSIA - Tags: ANIMALS ENVIRONMENT)