Zoo announces a birth

The Philadelphia Zoo has a new addition.

Stella, one of the zoo's giraffes, gave birth to a calf on Saturday.

The female is the first giraffe born at the Zoo in 13 years and is the first offspring of Stella, 9, and Gus, 4.

The Zoo says mother and calf are doing well but the first few weeks of the newborn's life are critical and she will be closely monitored by animal and veterinary staff.

No date has been set yet for the calf's public debut.