Visitors to the Lincoln Park Zoo might have to look closely to catch a glimpse of the newest addition in the primate house.
Zoo officials say a Bolivian gray titi (TEE'-tee) monkey was born Saturday to a 21-year-old mother and 15-year-old father.
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The baby is just a few ounces and spends most of its time nestled in its mother's fur. It's not yet clear whether the baby is male or female.
Titi monkeys are native to South America, where their numbers are shrinking. They're small and furry, with tails longer than their head and body.
The baby is the ninth for its parents, considered one of the most successful mating pairs on record.
Mom, Delasol, also is the oldest of her species to give birth in a North American zoo.
"The baby is spending most of its time nestled in the thick fur on mom's back, but we do get a glimpse of its little face peeking up now and then," said Curator of Primates Maureen Leahy. "Dad and the siblings are playfully curious with the new arrival, and the whole group is responding appropriately to the addition."
Titi families are known for being tight-knit, and fathers and siblings pitch in with childcare duties early on. The titi monkeys at Lincoln Park Zoo can often be seen sitting closely together on the same branch and intertwining their tails as a bonding behavior.