A Kamchatka Brown Bear cub eats frozen fruits during a Christmas feeding session at Hagenbecks zoo in Hamburg, northern Germany on December 5, 2014. (Photo by Fabian Bimmer/Reuters)

Kamchatka Brown Bear Mascha climbs through a Christmas tree, decorated with fruits and fish at Hagenbecks zoo in Hamburg, northern Germany December 5, 2014. (Photo by Fabian Bimmer/Reuters)

Kamchatka Brown Bear Mascha stands beside a Christmas tree, decorated with fruits and fish, at Hagenbecks zoo in Hamburg, northern Germany on December 5, 2014. (Photo by Fabian Bimmer/Reuters)

Kamchatka Brown Bear Mascha and one of her three cubs eat frozen fruits during a Christmas feeding session at Hagenbecks zoo in Hamburg, northern Germany on December 5, 2014. (Photo by Fabian Bimmer/Reuters)

Kamchatka Brown Bear Mascha stands beside a Christmas tree, decorated with fruits and fish, at Hagenbecks zoo in Hamburg, northern Germany on December 5, 2014. (Photo by Fabian Bimmer/Reuters)

Kamchatka Brown Bear Mascha and her three cubs are seen during a Christmas feeding session at Hagenbecks zoo in Hamburg, northern Germany on December 5, 2014. (Photo by Fabian Bimmer/Reuters)

A Kamchatka brown bear stands next to a Christmas tree decorated with fruit and vegetables in the enclosure at the Hagenbeck zoo in Hamburg, northern Germany, Friday December 5, 2014. (Photo by Malte Christians/AP Photo/DPA)

A Kamchatka brown bear looks at a Christmas tree decorated with fruit and vegetables in the enclosure at the Hagenbeck zoo in Hamburg, northern Germany, Friday December 5, 2014. (Photo by Malte Christians/AP Photo/DPA)