Rangers have been recording footage of the gorillas they protect

The Democratic Republic of Congo's Virunga National Park and the surrounding Virunga volcanoes region are home to more than half of the world's population of mountain gorillas.

To ensure the long-term survival of this threatened species, teams of rangers monitor and patrol the park's Gorilla Sector.

Two of the rangers, Diddy and Innocent, have been keeping a weekly diary for the BBC News website that offers an insight into life on the frontline of conservation.

Here, they also share video footage that they have been recording over the past few months.

GETTING TO GRIPS WITH GORILLA TALK

Diddy, who has been a ranger for more than 16 years, gives an entertaining first lesson on gorilla communication.

MEET THE GORILLAS

Here is footage of some of the park's gorilla groups, known as "families", which are named after the dominant male or "silverback".

'MY FAVOURITE GORILLA'

Innocent, head of gorilla monitoring, is able to recognise every gorilla within the sector.

Each animal has a unique "nose print" that enables rangers to tell them apart.

Here, Innocent explains why the giant ape nicknamed "the bald gorilla" is his favourite.

THE JULY MASSACRE

In July 2007, the Virunga National Park grabbed headlines around the world for all the wrong reasons.

Several gorillas were shot dead by gunmen; an act described as "senseless and tragic" by conservationists.

Innocent recalls how he felt when he heard the news, and the aftermath of the "massacre".

(Some people may find this film upsetting)

PROFILE OF THE RANGERS

Innocent

Diddy