Two female orphaned California sea lion pups nuzzle each other

Two female orphaned California sea lion pups nuzzle each other at Brookfield Zoo, in Brookfield, Ill.

A James Flamingo chick stands next to other James flamingos in their enclosure in the zoo of Berlin

A James Flamingo chick stands next to other James flamingos in their enclosure in the zoo of Berlin 

Tian Tian a retired female bear has become a celebrity in a Chinese zoo by posing for pictures with tourists.

Tian Tian a retired female bear has become a celebrity in a Chinese zoo by posing for pictures with tourists.  

A six-day old Chilean flamingo chick is nurtured by an adult at San Francisco Zoo

A six-day old Chilean flamingo chick is nurtured by an adult at
 San Francisco Zoo

A penguin fights with a duck in their enclosure at the zoo

A penguin fights with a duck in their enclosure at the zoo

Two 6-week-old black panther cubs are shown off to the media at the Tierpark zoo

Two 6-week-old black panther cubs are shown off to the media at the Tierpark zoo in Berlin, Germany

Baby "Ligers" : hybrids of lions and tigresses

Baby "Ligers", which are hybrids of lions and tigresses,
sleep inside a private zoo in Tainan 

Monkeys take a cool shower at Xiangshan zoo in Huaibei

Monkeys take a cool shower at Xiangshan zoo in Huaibei

A north Chinese leopard cub goes on display at Hamburg zoo.

A north Chinese leopard cub goes on display at Hamburg zoo.

A week-old Mount Apo lorikeet is fed by a keeper at Chester Zoo

A week-old Mount Apo lorikeet is fed by a keeper at Chester Zoo in northern England

A trio of Magellanic penguins

A trio of Magellanic penguins waddle through the San Francisco Zoo to their new home on Penguin Island 

Three baby panthers were recently born at the zoo of Amneville

Three baby panthers, including this little one, were recently born at the zoo of Amneville in Metz

A mob of meerkats in their enclosure at Bristol zoo Gardens

A mob of meerkats in their enclosure at Bristol zoo Gardens

A Rothschild giraffe, 'Nora,' is seen with her newborn foal at Prague's zoo

A Rothschild giraffe, 'Nora,' is seen with her newborn foal at Prague's zoo 

Three snowy owls chicks stand on a barrel at the Hanover zoo

Three snowy owls chicks stand on a barrel at the Hanover zoo in northern Germany

'Zeina,' licks one of her four newborn cubs inside their cage

'Zeina,' licks one of her four newborn cubs inside their cage at Jordan's zoo in Yaduda

Jackass Penguins keep cool under water shower

Jackass Penguins keep cool under water shower at a zoo in Tokyo
   

'Shuan Shuan' the Panda bear will be in Guadalajara at the zoo for six months

'Shuan Shuan' the  Panda bear will be in Guadalajara   zoo  for six months

A newborn male Grant's Zebra is flanked by his mother

A newborn male Grant's Zebra is flanked by his mother Wendy at the Rome Zoo

Manya the giraffe calf, inspects her enclosure with other giraffes

Manya the giraffe calf, inspects her enclosure with other giraffes .


Hermann J. Knippertz / AP