A western lowland gorilla named Mandara gave birth to her sixth baby in the Great Ape House on January 10. The zoo isn’t sure if the tiny gorilla is a boy or a girl yet, because Mom’s keeping the baby all to herself for now.

Western lowland gorillas are listed as a critically endangered species, so these births are especially important. There have been seven successful  western lowland gorilla births at the National Zoo in Washington, D.C. since 1991.

See baby pictures and watch a video at the National Zoo.

Get the facts on mountain gorillas in the Creature Feature.