Couple's romantic exchange of vows ruined by bear mauling moose nearby

A couple were left shocked after their romantic wedding vow recital was ruined by no other than a grizzly bear - who was captured attacking and eating a moose calf nearby.

The pair's mood completely shifted when they saw what was going on behind them at Montana's Glacier National Park.

A lucky Stanton Giles, a wedding videographer, managed to capture the graphic footage on camera and posted it to his YouTube channel.

Since being posted on the 18 August, it has been viewed nearly a whopping 10,000 times.

In the incredible footage, the camera focuses on the groom as he recites his vows. All of a sudden, a strangled cry can be heard in the distance.

The poor moose stood no chance against the grizzly bear (Getty Images)

The camera then cuts and pans away to show a bear on top of a moose calf, kicking its legs but to no avail.

Stanton continues to film the footage for several minutes, while the couple and guests are heard commenting on what is happening in front of their very eyes.

YouTubers have taken to comment - completely mesmerised by the fact the cameraman was able to capture such a happening.

YouTubers have been left mesmerised by the footage the cameraman managed to get (Getty Images)

One wrote: "Crazy you captured this mid-ceremony."

Another viewer commented: "Now the question is how do you incorporate a moose being eaten by a bear in a wedding video."

While a third said: "What an omen lol."

The video description reads: "A wedding ceremony was taking place on the shore of Two Medicine Lake in Glacier National Park, when most of the way through the groom's vows, a grizzly charged out of the brush onto the north shore and attacked a moose calf as the mother looked on."

According to the National Park System (NPS), grizzly bears are omnivores, with more than 90 per cent of their diet consisting of grass, berries and insects. However, what they specifically eat changes from season to season.

Officials with the NPS added: "They will also eat large and small mammals, fruit, bark, roots and mushrooms when they are available."

The behaviour of grizzly bears is also very unpredictable.

And although rare, attacks on humans have occurred - with some resulting in serious injuries and death.