Leonardo DiCaprio is struggling to recall any lighthearted anecdotes to entertain fans while promoting his new movie The Revenant as the gruelling shoot was no fun.

Director Alejandro Gonzalez Inarritu's movie stars the Titanic actor as fur trapper Hugh Glass, who was left for dead by his associates after being mauled by a grizzly bear.

The nine-month shoot involved painstaking filming in freezing conditions in Canada and Argentina, and Leonardo has previously admitted it is one of the toughest films he has ever made.

He often feared he was at risk of hypothermia, and he even had to eat raw offal for one scene, and the intense shoot left him with no fun memories to amuse interviewers.

During an appearance on U.K. TV show This Morning on Thursday (14Jan16), the actor said, "I've been asked to talk about fun stories from this experience. It was difficult to come up with one, if any. It was absolutely tough, there were no lighthearted moments, we weren't jumping around playing practical jokes with each other off camera. It was pretty much, 'Let's just get the hell out of the cold and eat something warm', that was our primary focus every day after work."

Leonardo has previously spoken of the lengths he went to on location to accurately portray Glass' bravery, saying, "I can name 30 or 40 sequences that were some of the most difficult things I've ever had to do. Whether it's going in and out of frozen rivers, or sleeping in animal carcasses, or what I ate on set. (I was) enduring freezing cold and possible hypothermia constantly."