Grizzly and Black Bears are sympatric through their range in Canada(and in a few National Parks in the USA) and historically do a pretty good job of staying out of each others path................However, it is known that on occasion, Grizzlies can and do kill and eat Black Bears.......................Apparently this did take place up in Banff National Park in Canada this past April.............Biologist investigation revealed that a Black Bear was out foraging when a Griz stumbled upon it........Death came quickly for the Black Bear!

Grizzly bear eats black bear on

 popular Banff hiking trail

calgaryherald.com

Grizzly bear No. 122 feeds on a moose carcass in April. 

The 225- to 275-kilogram bear completely consumed a 

black bear in Banff National Park last week.

A large male grizzly bear is showing everyone who's boss
in the mountain parks. Earlier this month, officials closed
the Sundance Canyon area in Banff National Park after a
 group of hikers came upon a bear known as No. 122
feeding on a carcass. They reopened the trail late
Tuesday after he moved on.

During the investigation into the incident, officials
determined the carcass was a small black bear. "It
 had been completely consumed," said Steve Michel,
 a human wildlife conflict specialist with Banff National
 Park. "There was nothing remaining other than a
skull, a hide, the four paws and some bones."

It's believed it was a predatory attack on the black
 bear."There were indications the black bear was
 foraging on the trail at the time," he said. "It looks
 like that black bear just happened to find himself
in the wrong place at the wrong time when a very
large grizzly bear came by."

Michel said he didn't expect there was much of a fight.

"This is grizzly bear No. 122, so he's a very large
 grizzly bear," he said, noting it's a 225- to 275-
kilogram grizzly bear killing a 45-kilogram black
 bear. "I don't think there would have been much
 of a brawl that took place. "It would have been
 fairly quick."

Although it's not a common occurrence, Michel
 said there are other documented cases of grizzly
 bears feeding on black bears — including No.
 122 eating another small black bear around the
 same time last year.

"He's definitely the dominant animal out on the
 landscape, so there are very few animals that
 would compare against him in terms of size," he said.