This greedy grizzly appears to have bitten off more than she can chew - after catching two fish in her mouth at the same time.

Watched by three hungry cubs the mother bear was demonstrating the skill of fishing to her young.

Perched on the edge of a waterfall, she manages to keep her balance as the salmon unwittingly leap out of the water and into her menacing jaw.

She may look like a graceful and loving mother but she's also a vicious fighter - as one unfortunate bear found out when he tried to steal her cubs' dinner.

Lashing out with her enormous paws she proves she's a force not to be reckoned with.

And her cubs seem to be just as feisty as their mother - running off with their fish while the distracted adults are locked in battle.

These spectacular pictures were captured by wildlife photographer Roman Golubenko in Katmai National Park, Alaska.

The location is so remote it can only be reached by seaplane but the dedicated 44-year old was prepared to make the journey.

He said: "Travel and photography has been the meaning of my life ever since I was 10 years old - when I was given my first camera.

"I am one of those people who would search the ends of the worlds for at least one beautiful shot."

Mr Golubenko, from North Bergen, in New Jersey, America, spent four days at the park's Naknek Lake - where around 200 grizzlies gather each year for a feeding frenzy.

He said: "The most interesting moment was when the mother bear arrived at the waterfall with her three cubs. That's when another male bear scooted over next to her.

"Everything was peaceful over the river until the mother bear caught a fish and wanted to share it with her cubs and the male bear decided to steal the salmon.

"Instantly, the mother bear transformed into a fierce monster from a gracious and loving mother.

"The fighting bears roared so menacingly and fought so violently that their energy raised a fountain of water droplets into the air.

"It was so loud that the bears fishing on the other side of the river curiously stood up on their hind legs for a few seconds to observe what was going on.

"And while the adult bears were fighting over the salmon, one of the cubs got a hold of the fish and trotted away with it."

Grizzly bears, a type of brown bear, can stand up to eight-feet tall on their hind legs and can weigh up to 1000 lbs.

Despite being a solitary species, they will congregate at streams, lakes and rivers during salmon spawn.

They need to eat around 90 pounds of the fish each day to gain enough fat for their winter hibernation.

Grizzlies are considered to be the most aggressive of the bears - with the female most likely to attack when defending their young.

But, despite their reputation, they hardly ever view humans as prey and avoid contact with people.

Most bear attacks on humans are put down to the animal's desire to protect a cub or a food supply.

MUST CREDIT PHOTOS BY: Roman Golubenko / Solent / Rex Features