“Hilla”, a 6-week old female baby Northern Fur Seal or Callorhinus ursinus is seen in Hannover's Zoo Yukon Bay on July 23, 2015 in Hanover, Germany. Two baby Callorhinus ursinus' were born at the end of May and early June 2015. (Photo by Alexander Koerner/Getty Images)

Newborn sea lion “Kaya” swims at the enclosure at the zoo in Wuppertal, Germany July 23, 2015. Kaya was born on July 4, 2015 in the zoo, officials said. (Photo by Ina Fassbender/Reuters)

Newborn sea lion “Kaya” lies beside her mother at the enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)

Newborn sea lion “Kaya” crawls at the enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)

A sea lion swims at an enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)

The sea lion “Mylo” is fed by a zookeeper at an enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)

Newborn sea lion “Kaya” looks at her mother at an enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)

A zookeeper holds three new born beavers at an enclosure at the zoo in Wuppertal, Germany July 23, 2015. The beavers were born on July 21, 2015 in the zoo, officials said. (Photo by Ina Fassbender/Reuters)

Flamingos stand at an enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)

A zookeeper holds a new born beaver at an enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)

A zookeeper holds a new born beaver at an enclosure at the zoo in Wuppertal, Germany July 23, 2015. (Photo by Ina Fassbender/Reuters)