St. Louis (KSDK) -- The Saint Louis Zoo is celebrating the arrival of a baby monkey. The black and white colobus monkey was born at the Primate House on June 30.

The infant is the sibling of Mosi, the first colobus to be born at the Zoo in 11 years. Mosi is now 13 months old.

Zoo officials say they will have to wait to name the newborn until they can determine the monkey's gender.

While adult colobus monkeys are primarily black with white har around their face and half of their tail, infants are born with all white hair and a pink face.

The 24-year-old mother Roberta came to the Saint Louis Zoo in 2010 from the Binder Park Zoo in Michigan. Roberta was easily integrated with the Zoo's 13-year-old female Cecelia, and both the new baby's and Mosi's father, six-year-old Kima.

The family of five is now on exhibit. Visitors can see the infant poking its head out to look at its new world.

"It was believed that Roberta, who is an experienced mother, was likely post-reproductive when she arrived here," says Ingrid Porton, curator of primates at Saint Louis Zoo. "Happily she proved this to be quite incorrect."

Colobus monkeys are found throughout the forests of central Africa. The birth is part of the Association of Zoos and Aquariums' Colobus Species Survival Plan (SSP), a program to manage a genetically healthy population of black and white colobus monkeys in North American zoos.

"Roberta is an attentive and protective mother. Mosi is very curious about the new infant and mom allows him to sniff the infant, but when he tries to touch, she has pushed him away," says Porton. "We are looking forward to the time when his sibling will be old enough to be Mosi's play partner."

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