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14 week-old twin polar bear babies rest with their mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479507165 )

14 week-old twin polar bear cubs play during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479507679 )

14 week-old twin polar bear cubs play next to their mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479508325 )

14 week-old twin polar bear cubs play during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479507683 )

Two 14-week old polar bear twins and their mother Giovanna explore their enclosure at the Hellabrunn zoo in Munich, Germany, Wednesday, March 19, 2014. The cubs who were born on Dec. 9, 2013 were presented to the public for the first time. (AP Photo/dpa, Sven Hoppe) ( Germany Zoo )

Two 14-week old polar bear twins explore their enclosure at the Hellabrunn zoo in Munich, Germany, Wednesday, March 19, 2014. The cubs who were born on Dec. 9, 2013 were presented to the public for the first time. (AP Photo/dpa, Stephan Jansen) ( Germany Zoo )

One of the 14 week-old twin polar bear babies is seen under her mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479507167 )

Two 14-week old polar bear twins explore their enclosure at the Hellabrunn zoo in Munich, Germany, Wednesday, March 19, 2014. The cubs who were born on Dec. 9, 2013 were presented to the public for the first time. (AP Photo/dpa, Sven Hoppe) ( Germany Zoo )

14 week-old twin polar bear cubs play next to their mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479508319 )

The two 14 week-old polar bear twins explore on March 19, 2014 the outdoor enclosure with mother Giovanna at Tierpark Zoo in Munich. (STEPHAN JANSEN/AFP/Getty Images) ( 528189141 )

The two 14 week-old polar bear twins explore on March 19, 2014 the outdoor enclosure with mother Giovanna at Tierpark Zoo in Munich. (STEPHAN JANSEN/AFP/Getty Images) ( 528189168 )

14 week-old twin polar bear cubs play during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479508239 )

The 14 week old polar bear twins come with their mother during the first outside excursion in the zoo in Munich Hellabrunn, southern Germany, on March 19, 2014. (CHRISTOF STACHE/AFP/Getty Images) ( 528190979 )

The 14 week old polar bear twins play with their mother in their enclosure during the first outside excursion in the zoo in Munich Hellabrunn, southern Germany, on March 19, 2014. (CHRISTOF STACHE/AFP/Getty Images) ( 528189822 )

14 week-old twin polar bear cubs are seen with their mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479508253 )

Two 14-week old polar bear twins explore their enclosure at the Hellabrunn zoo in Munich, Germany, Wednesday, March 19, 2014. The cubs who were born on Dec. 9, 2013 were presented to the public for the first time. (AP Photo/dpa, Stephan Jansen) ( Germany Zoo )

One of the 14 week-old twin polar bear cubs plays with her mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. The male and female twins were born on December 9, 2013 in the zoo. (Photo by Alexandra Beier/Getty Images) ( 479508251 )

The 14 week old polar bear twins play with their mother in their enclosure during the first outside excursion in the zoo in Munich Hellabrunn, southern Germany, on March 19, 2014. (CHRISTOF STACHE/AFP/Getty Images) ( 528190382 )