Natalie Portman will join Jack Hanna for a special Animal Planet documentary on endangered gorillas.

“Saving a Species: Gorillas on the Brink” will follow the pair as they journey deep into Rwanda’s rainforest to observe some of the mere 700 gorillas still in existence.

According to the Mountain Gorilla Veterinary Project, mountain gorillas suffer from human-induced injuries and illness associated with poaching, war, and habitat loss.

The show will air tomorrow at 9 p.m. ET on Animal Planet.