Portman stars in endangered gorillas documentary

Actress Natalie Portman has teamed up with animal expert Jack Hanna for a US TV special on gorilla treks in Rwanda.

The Garden State star features in Gorillas On The Brink, an hour-long documentary set to air on TV network Animal Planet later this year.

The film about endangered gorillas sees Hanna take Portman on a trek around Congo's Virunga National Park.