In Yellowstone there are two species of bears to look-out for: American Black Bears and Brown, or Grizzly Bears.
Sounds straightforward eh? One's black and the other brown you'd think. You'd think wrong.
You see some brown bears are technically black. This is when the individual is referred as a 'cinnamon' and then you have a brown black bear. Just to keep you guessing some grizzlies are really dark so at a distance you can have black brown bears. Confused yet?
Once again you have to study the structure and the look of the animal to distinguish the two: Black bears have larger ears and fur like velvet (check those bearskin hats). Grizzlies have a shoulder lump and a coarse coat which can take on a two tone look. Black's head profile shows a straight nose; a Grizzly nose can be slightly upturned and make it pig-like (though don't tell it I said so).
Drawing bears is like drawing birds. You look hard and you notice subtle differences. You'd better remember to keep your distance though.....