The zoo said the birth came at 2:17 a.m. Friday, and the youngster is healthy, vigorous and loud.
Or as zoo Director Kim Smith put it: "She's definitely got a great set of pipes."
The zoo said the newborn has begun nursing. She won't go public until Rose-Tu has established a maternal bond, she's comfortable with staff members and she has a chance to bond with the rest of the herd. A name is to be chosen through an online vote.
The calf is Rose-Tu's second and the zoo's 28th, beginning with Packy in 1962.
Rose-Tu became pregnant 21 months ago by Tusko, also the sire of her first-born, a male named Samudra.
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