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A lion cub yawns near its mother at the Maruyama Zoo in Sapporo, northern Japan.

A baby golden lion tamarind clings to the back of its mother, Rosie, at the Denver Zoo.

First-time mother Negara, a 14-year-old orangutan, holds her infant son Nyaru at his first public showing at the Perth Zoo, in Perth, Australia.

Polar bear cub Wilbaer stands beside his mother Corinna during his first outing at the Wilhelma Zoo in Stuttgart, Germany.

A duck leads her ducklings down a set of steps near the Capitol Building on the National Mall in Washington, D.C., during a wet spring day.

A tapir baby hides between his mother Conchita's legs in the Hanover Zoo in Hanover, Germany.

A baby kangaroo peers out from its mother's pouch at Sofia Zoo in Sofia, Bulgaria.

Nakarla, a 3-month-old baby bonobo, is held by its mother Ukela at the Zoo Frankfurt in Frankfurt, Germany.

Newborn Bengal tiger cubs play with their mother in their enclosure at the Assam State Zoo in Guwahati, India.

A 290-pound male elephant calf stands next to its mother, 24-year-old Felix, at the Maryland Zoo in Baltimore.

The 1-month-old panda cub Mei Lan rests with its mother, Lun Lun, at the Zoo Atlanta.

A rare female Amur leopard cub takes her first steps outside her den with her mother, Ascha, at Marwell Zoological Park in Hampshire, Britain.

A newborn baby zebra stands with its mother Yoko at a zoo in Lima, Peru.

A young Reeve's turtle crawls over its mother's back at the Zoo Eberswalde in Eberswalde, Germany.

A brown bear and her cubs travel down the snow and ice-laden Copper River near Cordova, Ala.

Giraffe mother Rahima licks her newborn at the Zoo Dortmund in Germany.

Indian rhinoceros Betty and her baby walk through their enclosure at the Tierpark Zoo in Berlin.

The mother of the three baby meerkats plays with one of them in her enclosure at Bristol Zoo in Bristol, England.

A mama pigmy hippopotamus nudges her newborn, named Boseda, at the Attica Zoological Park in Athens, Greece.

Gorilla mom Bagira holds her baby boy Niklas at the Munich Zoo in Germany.

At the Central Park Zoo in New York, a chinstrap penguin named Beaker cuddles with her two chicks -- one who's visible at left, and the other who's obscured under it's mother's wing.

A 1-month-old anteater rides on her mother's back at the Cali Zoo in Cali, Colombia.

A cheetah and her cubs observe the plains in the Masai Mara game reserve in Kenya.