New male gorilla for London Zoo

London Zoo is introducing a new male (Kesho) to its group of gorillas.

London Zoo's all-girl gorilla enclosure is expecting a new arrival

They have been without a troop leader since the last male died in March and the zoo says Kesho will be crucial to the stability of the group.

But it says introducing a silverback from Dublin Zoo will be risky.

Female gorilla Mjukuu is pregnant and due to give birth in a couple of months. If the zoo waits until then to introduce a new male, there is a high risk he will kill the baby.

Dr Kirsten Pullen, who is an expert on gorilla behaviour said:

"When females are left on their own, there is an increase of tension and stress as there isn't a strong female to female bond. Without a male, the females often end up fighting and have to be separated."