Gentelmen, the State of Alaska considers the Inland Grizzly, and the coastal Brown bear as one species,for licenseing, and as HUNT375 says, the main difference is size. However, for trophy considerations the Caostal Brown Bear Bear is the Bear found from the coast, to 50 miles inland, and the bears found out side that coastal strip are called inland grizzlies, or tundra grizzlies. The inland grizzly is far more aggressive, than the Coastal brown Bear. The reason being, the inland grizzly has to cover a approximetly 100 sq mile terratory to make a liveing, while the Caostal Brown, has a much more steady and plentiful food supply. The Brown's diet of very high protene rich Salmon, accounts for his much larger size, and his lack of aggression in mastering his range. He has simply to move to the next stream.

Either one of these bears is a danger to man, if he gets too close, or surprises him in the thick alders. If the bears has an opening when he sees a man at any distance, he will move away!

As far as the large bears are concearned, the polar is far more dangerous that any other bear. The polar is the only animal in North America that will actually stalk man for food. Because of his habitate, he considers anything that moves on the ice to be food. Though he is smaller than the Coastal Brown, he is more of a true danger to man in his habitate!

As to listing dangerous game for North America, I would list them this way, in order of danger:

#1 Polar Bear (second largest bear)

#2 Inland Grizzley, (about 2/3 the size of the Brown)

#3 Coastal Brown Bear (largest bear)

#4 Lower 48 Grizzley ( about half the size of the inland grizz, about the size of a 1 yr old Brown bear cub, rarely over 400 lbs)

#5 Black Bear ( average of about 150 lbs )

#6 Big Russian boar, if wounded, or cornered!

#7 Mt Lion, In areas where all hunting of them has been curtailed they are a danger to adults, but in areas where they are hunted, they are only a danger to small children, and pets. To hunters, only when wouded or cornered!

#8 American alligator, only if wadeing, or swimimg in the dark of night!

Bobcats, Lynx, Coyotes, and wolves, are not a danger to anything but livestock!

Jaguar is so rare any place north of the Pannama Canal, he can't be considered North American game today!