Western lowland gorilla Bana holds her new baby born Oct. 11 at the Lincoln Park Zoo. The unnamed infant will be put on display starting Wednesday, Oct. 17, at the zoo's Regenstein Center for African Apes. | Rich Hein~Sun-Times

Western lowland gorilla Bana holds her new baby born Oct. 11. at the Lincoln Park Zoo. The unnamed infant will be put on display starting Wednesday, Oct. 17 at the zoo's Regenstein Center for African Apes. | Rich Hein~Sun-Times

Western lowland gorilla Bana holds her new baby born Oct. 11 at the Lincoln Park Zoo. The unnamed infant will be put on display starting Wednesday, Oct. 17, at the zoo's Regenstein Center for African Apes. | Rich Hein~Sun-Times

Western lowland gorilla Bana holds her new baby born Oct. 11. at the Lincoln Park Zoo. The unnamed infant will be put on display starting Wednesday, Oct. 17 at the zoo's Regenstein Center for African Apes. | Rich Hein~Sun-Times

Western lowland gorilla Bana holds her new baby born Oct. 11. at the Lincoln Park Zoo. The unnamed infant will be put on display starting Wednesday, Oct. 17 at the zoo's Regenstein Center for African Apes. | Rich Hein~Sun-Times

A baby gibbon drinks milk of its mother named Lina on October 11, 2012 in Osnabruck zoo, northern Germany. The gibbon was born on September 25, 2012. AFP PHOTO/Friso Gentsch/ GERMANY OUTFRISO GENTSCH/AFP/GettyImages

Veterinarians measure the giant panda cub at the San Diego Zoo this morning during his weekly exam, October 9, 2012. The panda measures 11 inches (28 cm) from the base of his head to the tip of his tail. His overall length, from the tip of his nose to the tip of his tail, is approximately 20 inches (53cm). He weighed 7.3 pounds (3.3 kilograms) on Tuesday morning. The panda cub remained very calm during his exam, which the staff believes is because he had just finished nursing and had a full stomach. At one point staff seemed to think he might fall asleep. Beth Bicknese, senior veterinarian for the San Diego Zoo, noted that she could feel his teeth just below his gums. While pandas have dentition consistent with other carnivores, their molars are larger and flatter than other bear species. The shape of their teeth is believed to be an evolutionary adaption for their diet of bamboo, which is a hard grass that they grind between their teeth before swallowing. Panda cubs will nurse from their mothers as their primary source of nutrition until they are about a year old and are not expected to start eating bamboo until then. The giant panda cub and his mother, Bai Yun, can be viewed on PandaCam www.sandiegozoo.org/pandacam 24 hours a day. AFP PHOTO / SAN DIEGO ZOO / Ken BOHN == RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT " AFP PHOTO / SAN DIEGO ZOO / Ken BOHN" / NO MARKETING / NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS ==KEN BOHN/AFP/GettyImages

Two North Chinese Leopard cubs (Panthera pardus japonensis) look out of a basket as they are presented for first time to the public at the Tierpark Zoo in Berlin, Friday, Oct. 5, 2012. The North Chinese Leopard twins were born on Aug. 4, 2012. (AP Photo/Markus Schreiber)

A female bison calf born May 16, scampers with its mom Leotie and the other bison at Brookfield Zoo's Great Bear Wilderness Exhibit Wednesday morning. The female calf marks the first birth of this species at the zoo since the early 1970's. | Rich Hein~Sun-Times

Mother panda Rauhin holds her baby panda, born on August 10, 2012 at the Adventure World zoo in Shirahama in Wakayama prefecture, western Japan on October 5, 2012. The baby panda, weighing 2,705gms, was named Yuhin on October 5. AFP PHOTO / JIJI PRESS JAPAN OUTSTR/AFP/GettyImages

Lincoln Park Zoo's newborn zebra colt with his mom, Adia. | Lincoln Park Zoo photo

Mama dolphin Piquet swims with her new calf at the Shedd Aquarium. | ©Shedd Aquarium ~ Brenna Hernandez.

Shedd Aquarium, announces that its beluga whale Mauyak (MAH-yak) successfully gave birth to a healthy calf Monday, Aug. 27, at approximately 2 a.m. Shedd’s animal care team estimates that the calf is 4½ feet long and weighs about 150 pounds. Both mother and calf appear to be doing well and will remain under 24-hour observation by the animal health staff in Shedd’s Abbott Oceanarium.

In this Sept. 23, 2012 photo provided by Utah's Hogle Zoo, mother giraffe Kipenzi stands behind her baby girl shortly after birth. The new baby giraffe and her mother went on display at Utah's Hogle Zoo for the first time on Oct. 3, 2012. (AP Photo/Utah's Hogle Zoo)

A kiwi chick hatches at Auckland Zoo in Auckland, Wednesday, Sept. 12, 2012, during its spring breeding season. The chick, a flightless bird that will grow to about the size of a domestic fowl, is the fifth born this season and has been named Nick 1. (AP Photo/New Zealand Herald, Greg Bowker)

Female liliger cub Kiara, a hybrid between a lion and a ligress, at the Novosibirsk Zoo, in Novosibirsk, eastern Sibiria, Wednesday, Sept. 19, 2012. Kiara is the first female liliger born over a month ago at the Novosibirsk Zoo. Kiara's mother, Zita, stopped producing milk almost immediately after giving birth, so Zoo employees placed Kiara in a separate facility and feed her with a special milk mix. The cub plays with a house cat which also provides motherly warmth. (AP Photo /Ilnar Salakhiev)