Two sisters were photobombed by a giant silverback gorilla after they unpeeled two bananas outside his enclosure.

Six year old Ella O’Brien and sister Bridget, four, were visiting Werribbe open-range zoo in Melbourne, Australia, when they posed for a souvenir picture.

Motaba the 20-stone gorilla was clearly upset the toughened glass was keeping him from his favourite snack – hence the King Kong impression.

Motaba, who celebrated his 29th birthday last year, and his two sons – Yakini and Ganyeka – are the star attractions at the zoo and live in a luxurious 6,000 square-metre pen.

The zoo’s new ‘Go Bananas With Gorillas’ programme enables visitors to get up close to the gorillas at special daily feeds