Bat, an African penguin, fell earlier this month. An X-ray determined the female was carrying an unfertilized egg, The Atlanta Journal-Constitution reported Friday.
Greg Bossart, the aquarium's head of veterinary medicine, decided to induce labor late Thursday after the animal's condition worsened.
The newspaper said the egg got stuck after labor. Bossart said he was then forced to use a needle to puncture the egg." The egg was then crushed and extracted.
"Bat is doing much better," said Dave Santucci, an aquarium spokesman.
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