A Siberian tiger eats a frozen chicken during a hot summer day at Rio de Janeiro's zoo
A Siberian tiger eats a frozen chicken during a hot summer day at Rio de Janeiro's zoo January 9, 2013. According to a local climate institute, temperatures in Rio de Janeiro on Wednesday rose up to 35 degrees Celsius (95 degrees Fahrenheit). REUTERS/Sergio Moraes (BRAZIL - Tags: ANIMALS SOCIETY ENVIRONMENT)