Justice, one of four 6-week-old tiger cubs introduced at Siegfried & Roy's Secret Garden and Dolphin Habitat, is seen at The Mirage Hotel & Casino on Sept. 14, 2015 in Las Vegas.
Gabe Ginsberg/Getty Images
Affectionate Polar Bear Cub Sticks Out Tongue
Hope, a four month baby bear, plays with its mother Flocke at the Marineland animal park in Antibes, France on March 23, 2015.
Two Lovable Lamb Buddies Hang Out
A pair of lambs are pictured at Cannon Hall Farm in South Yorkshire, England on March 2, 2015.
Lynne Cameron/AP Photo
Baby Porcupines Nibble on a Bite
The coendou porcupine couple 'Joppi' and 'Fletcher' nibble on vegetables at the zoo in Frankfurt, Dec. 3, 2015. Coendou porcupines are nocturnal rodents related to porcupines and guinea pigs and native to the rain forests of Central and South America as well as Trinidad.
Rare Endangered Clouded Leopard Kitten Makes His Debut
An endangered clouded leopard gave birth to a single male kitten on March 7, 2015, at Tampa's Lowry Park Zoo.
Dave Parkinson/Lowry Park Zoo
Baby Orangutans Play Peekaboo
Two baby orangutans play with each other at the wildlife department in Kuala Lumpur, Malayasia, Oct. 19, 2015.
Meet 3 Adorable Baby Beavers
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.
Cuddly Red Panda Hangs Out
A baby red panda is pictured on Sept. 18, 2015 at the Leipzig Zoological Garden in Leipzig, Germany.
Peter Endig/AP Photo
Baby Elephant Snuggles With It's Brother
Four-week-old elephant Anjuli cuddles with his brother Assam, Aug. 12, 2015, in Hagenbeck Zoo in Hamburg.
Baby Seal Chills Out
A three-day old common seal pup is seen in Jihlava Zoo, Czech Republic on July 14, 2015.
Lubos Pavlicek/AP Photo
Hello, Blue Eyes! Park Welcomes Newest Lion Cubs
Two spotted mountain lion cubs make their debut at the Santa Monica Mountains National Recreation Area in California.
National Park Service
Penguin Celebrates Birthday With Unique Cake
The first Humboldt penguin born in the Philippines, named "Kaya", stands next to a three-tiered frozen "fish cake" placed in the penguin habitat at Manila Ocean Park to celebrate its first birthday, July 29, 2015, in Manila, Philippines.
Bullit Marquez/AP Photo
A Chimpanzee Hangs Out at the Zoo
Ruben, a three-year-old chimpanzee, plays at the Oklahoma City Zoo in Oklahoma City, July 2, 2015.
Sue Ogrocki/AP Photo
Baby Polar Bear Gets Swim Lessons from Mom
A polar bear cub makes a debut in the pool with the mother Rara at the Sapporo Maruyama Zoo, April 28, 2015, in Sapporo, Japan. The baby polar bear, whose name has not been decided, was born on December 21, 2014.
The Asahi Shimbun/Getty Images
Snow Leopard Cubs Take a Break Away From Mom
The Chicago Zoological Society (CZS), which manages Brookfield Zoo, released photos of two female snow leopard cubs born on June 16. The cubs - each of whom weighs about 10 pounds - are bonding with their 4-year-old mother, Sarani, in a behind-the-scenes den. They will likely make their debut in mid-October.
A Koala Snuggles With His Mom
A nine-month old koala joey cuddles with his mother, Cambee, at the San Diego Zoo, July 9, 2015 in San Diego.
Ken Bohn/San Diego Zoo
Meet Chick #23, Shedd Aquarium's Newest Rockhopper Penguin
Shedd Aquarium welcomes chick #23, a rockhopper penguin (Eudyptes chrysocome), hatched June 9, 2015 to parents Edward and Annie following penguin breeding season in March. The chick, to be named at a later date, weighed 57 grams at birth and came in at 200 grams at a recent weigh-in; full growth is expected after about two to three months.
Brenna Hernandez/Shedd Aquarium
Two Wolf Cubs Snuggle
Two three-week-old wolf cubs lie in a sleeping bag in the Wildenburg Wildlife Outdoor Enclosure in Kempfeld, Germany on June 2, 2015.
Harald Tittel/AP Images
Swimming Hippos Pose for the Camera
Animal care staff at the San Diego Zoo have determined that their new hippopotamus calf is a girl after nearly two months of waiting. The calf, born March 23, 2015 has been named Devi. Due to the very protective nature of a hippo mom, the calf was often kept tucked into vegetation growing along the edge of the hippo pool. Her mother, Funani, would also place her body between the baby and the viewing area. While she hasn't been weighed, keepers estimate that Devi weights between 90 and 110 pounds. Funani weighs nearly 3,500 pounds.
Ken Bohn/San Diego Zoo
Timber Wolf Pups Welcomed at Indiana Zoo
A 9-week-old female timber wolf stands on a wall Saturday, May 9, 2015 at Washington Park Zoo in Michigan City, Ind. The zoo introduced three new wolf pups - two females and one male - who will be on display in a new exhibit later this month. The zoo is asking for the public's help in naming the wolves, and is hold a naming contest through June 21.
Jessica O'Brien/The News-Dispatch/AP Photo
Baby Chick Hitches a Ride on Mom
A gosling rests on its mother's back, April 15, 2015, in Santa Clara, Calif.
Marcio Jose Sanchez/AP Photo
Lovable Jaguar Cub Roars for Camera
A one-month-old jaguar cub looks out from a bucket at the Leningrad Zoo in Saint Petersburg, Russia on April 15, 2015.
Olga Maltseva/AFP/Getty Images
Baby Gorilla Goes for a Ride
An infant western lowland gorilla makes its public debut at the Bronx Zoo, April 15, 2015.
Julie Larsen Maher/Wildlife Conservation Society
Baby Mouflons Hop Around
Two baby mouflons hop across a meadow of a game reserve near Ravensburg, Germany on April 7, 2015.
Felix Kaestle/AP Photo
Baby Tiger Frolics With Toy
A baby tiger named Dragan plays in its enclosure at Eberswalde Zoo, March 10, 2015, in Eberswalde, Germany.
Patrick Pleul/AFP/Getty Images
Cute Polar Bear Cubs Splash Through the Water
Two polar bear cubs follow their mother as they venture outside their enclosure for the first time since they were born at Ouwehands Zoo in Rhenen, Netherlands, Feb. 19, 2015.
Baby Giraffe Gives Mom a Kiss
A two day old female reticulated giraffe, also known as the Somali giraffe, is seen with her mother Malindi in the indoor enclosure at the Zoo in Duisburg, Germany, Feb. 13, 2015.
Frank Augstein/AP Photo
Tiger Cub Trudges Through the Snow
A male Siberian tiger named Dragan makes its way through the snow in an enclosure in the zoo in Eberswalde, Germany, on Jan. 31, 2015. Dragan was born on Oct. 7, 2014.
Patrick Pleul/dpa/AP Photo