HIMEJI, JAPAN - JULY 23: Yuki, a 15 year old polar bear, cools down by playing with 135 kilograms weight ice block at Himeji Zoo on July 23, 2014 in Himeji, Japan. Heat wave continues in many parts of Japan as temperature rising to 33 degrees Celsius today. Ministry of Health of Japan reported that the number of death from heat stroke in the past decade until 2013 amounted to 7344, 2.7 times of the previous decade. (Photo by Buddhika Weerasinghe/Getty Images)
