A Zoo Atlanta gorilla gave birth Thursday to the fifth western lowland gorilla born at the zoo in the past eight months.
The baby was born while the mother, Sukari, was on exhibit around 3 p.m., and a few zoo visitors who witnessed the birth alerted zoo staff, spokeswoman Susan Elliott said.
"It appears average in size and extremely healthy," Elliott said.
Gorilla mothers keep babies close to their body, so officials probably won't know the sex for three to five weeks. The baby will remain unnamed until they do.
Sukari and baby are expected to be on public exhibit this weekend, Elliott said.