A remarkable video has emerged from the UK of an orangutan appearing to be mesmerised by a pregnant woman's belly.

The footage, captured on July 17 in Colchester zoo, shows Rajang observing the woman's bump and kissing it through the window of his enclosure.

''The orangutan tried to cuddle, stroke and kiss her belly numerous times,'' the filmer later wrote online.

''This amazing animal has touched so many hearts already and now we have had the opportunity to have just one moment with him.''

''He was transfixed and emotional through out the time we spent with him,'' he added.

My wife, who is 34 weeks pregnant and I went to Colchester Zoo, UK and we were lucky enough to have an amazing experience with Rajang, this incredible Orangutan. He tried to cuddle, stroke and kiss her belly numerous times. This amazing animal has touched so many hearts already and now we have had the opportunity to have just one moment with him. He was transfixed and emotional through out the time we spent with him.