There is more reason for celebration on 20th May 2008 as the world’s only surviving gorilla twins; Byishimo and Impano, turn 4years. Born to Nyabyitondere, the now juvenile and healthy looking twins are not only a subject of interest to scientists but also the centre of attraction in the Susa family of gorillas.

Without concealing the joy, the Director General of Rwanda Tourism board, Rosette Rugamba said, "when the twins were born on May 20th 2004, nobody could have envisaged seeing both infants living till their forth birthday.” She adds that, not only is the birth of twins among gorillas very rare, but even when it happens; the survival of both twins is extremely unusual."

Conservationists and regular observers have always been concerned about the chances of their survival and the ability of the mother to care for two babies, especially as they were growing older. However, with everyday that passed, there was more hope for their long term survival, as the mother was making an incredible but successful job of caring for and feeding both infants.

Their bright future started at the first public gorilla naming ceremony in 2005, when they were privileged to be named by the first family, H.E the President of Rwanda Paul Kagame and the First Lady Mme Jeannette Kagame. They were named Byishimo (Happiness) and Impano (Gift).