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Cezar, a 32 year-old polar bear eats a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. Temperatures in Serbia have risen up to 40 degrees Celsius (104 degrees Fahrenheit), according to official meteorological data. (Photo by Marko Djurica/Reuters)

Cezar, a 32 year-old polar bear eats a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. Temperatures in Serbia have risen up to 40 degrees Celsius (104 degrees Fahrenheit), according to official meteorological data. (Photo by Marko Djurica/Reuters)




Cezar, a 32 year-old polar bear eats a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)

Cezar, a 32 year-old polar bear eats a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)




A zookeeper feeds a hippopotamus with a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)

A zookeeper feeds a hippopotamus with a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)




A zookeeper sprays water onto Twiggy, a 42 year-old asian elephant to help it cool down in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)

A zookeeper sprays water onto Twiggy, a 42 year-old asian elephant to help it cool down in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)




A zookeeper feeds a hippopotamus with a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)

A zookeeper feeds a hippopotamus with a watermelon in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)




A zookeeper sprays water onto Twiggy, a 42 year-old asian elephant to help it cool down in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)

A zookeeper sprays water onto Twiggy, a 42 year-old asian elephant to help it cool down in its enclosure in Belgrade's zoo, Serbia July 20, 2015. (Photo by Marko Djurica/Reuters)




Cezar, a 32 year-old polar bear cools off in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)

Cezar, a 32 year-old polar bear cools off in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)




Cezar, a 32 year old polar bear eats a watermelon in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)

Cezar, a 32 year old polar bear eats a watermelon in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)




A zookeeper sprays water onto an arctic wolf to help it cool down in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)

A zookeeper sprays water onto an arctic wolf to help it cool down in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)




A zookeeper feeds a hippopotamus with a watermelon in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)

A zookeeper feeds a hippopotamus with a watermelon in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. (Photo by Marko Djurica/Reuters)
21 Jul 2015 10:46:00