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)

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. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

One of the 14 week-old twin polar bear babies is pictured with her mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

One of the 14 week-old twin polar bear babies is pictured with her mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

One of the 14 week-old twin polar bear babies is pictured during the first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. (Photo by Alexandra Beier/Getty Images)

Two 14-week old polar bear twins explore their enclosure at the Hellabrunn Zoo for the first time in Munich, Germany, March 19, 2014. The cubs who were born on March 9, 2014 were introduced to the public on the morning of March 19. (Photo by Sven Hoppe/EPA)

Two 14-week old polar bear twins explore their enclosure at the Hellabrunn Zoo for the first time in Munich, Germany, March 19, 2014. (Photo by Sven Hoppe/EPA)

A polar bear cub plays next to its mother Giovanna outside in their enclosure at Tierpark Hellabrunn in Munich, March 19, 2014. Twin 14 week-old polar bear cubs, who have yet to be named, made their first public appearance on Wednesday. (Photo by Michael Dalder/Reuters)

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. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

One of the 14 week-old twin polar bear babies rests with her mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

14 week-old twin polar bear cubs are pictured with their mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

14 week-old twin polar bear cubs are pictured with their mother Giovanna during their first presentation to the media in Hellabrunn zoo on March 19, 2014 in Munich, Germany. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

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. (Photo by Alexandra Beier/Getty Images)

A handout photo issued by Tierpark Hellabrunn and dated March 17, 2014 shows polar bear Giovanna and her twins in the outdoor enclosure of the zoo Hellabrunn in Munich, Germany. The polar bear twins were born two weeks ago. (Photo by Marc Mueller/EPA)