Gray langur mother Sally holds her baby in its enclosure in Berlin's Zoo in Berlin on Feb., 21. 2014.
The nine-day-old giraffe Bine licks another giraffe named Andrea in Friedrichsfelde zoo in Berlin on May 9, 2014.
Allie, a 26-year-old bottlenose dolphin, swims with her newborn calf at the Brookfield Zoo in Brookfield, Ill., on Aug. 4, 2013.
Orangutan Niu-fang clings to her mother Xiang-niu at the Taipei Zoo in Taipei, Taiwan, on March 1, 2014. Niu-fang and her parents are Bornean oragangutans, an endangered species native to Malaysia and Indoneisia.
White lion Azira looks at her one-week old cub in their enclosure in Zoo Safari in Borysewo, Poland, on Jan. 30, 2014.
A sea lion and her newborn are seen at the animal exhibition park Marineland in Antibes, France, June 28, 2013.
An albino baby kangaroo peers out of the pouch of its mother at the zoo in Duisburg, Germany, on May 31, 2013.
A wolf plays with a one-month-old puppy in its enclosure of Berlin's Zoo in Berlin on May 31, 2013.
A ring-tailed lemur with its seven-week-old cubs clinging to its back sits on a rock at the Schoenbrunn zoo in Vienna, Austria, on May 10, 2013.
Giant panda Yuan Yuan holds her baby panda at the Taipei City Zoo in Taipei, Taiwan.
A polled hereford cow stands with her calf while feeding in a field on a farm near Carlisle, Iowa, on May 7, 2013.
An onager foal eats alongside its mother in their enclosure at the zoo Tierpark Hagenbeck in Hamburg, Germany on June 27, 2013.
Cygnets swim next to their mother in Stockholm on June 26, 2013.
A baby Asian macaque monkey with its mother in their enclosure at the Beijing zoo on June 24, 2013.
Twin polar bear cubs stand with their mother Giovanna in their enclosure at Tierpark Hellabrunn in Munich on March 19, 2014.
Spring lambs belonging to Somerset farmer Ian Berry sleep beside their mother in their enclosure in a building at the Bath and West Showground near Shepton Mallet on March 3, 2014 in Somerset, England.