Usualy with a boar bear the ears look smaller because of the big head. You have to see enough of them to be able to tell the difrence. A male bear will grow about a third bigger than a sow?
Hope this helps.
That's tough, since young boars can look like old sows. But if you have a big boar it starts to get easier because the head is beefier and they tend to have a more burly walk. One of the nice things about Alaska is you can hunt over bait. Although some people will debate that choice, it makes for a lot fewer mistakes. You have more time to study the bear, think it over, look for cubs, etc.
Tough call to tell between a boar and a sow. In addition to the info the others have posted, try to form a triangle between the ears and the tip of the snout. A large bear will have almost a perfect triangle shape, whereas a younger bear will have an uneven triangle. Also, a female will have a shorter snout compared to a boar who will have a snout more like a german shepard's.
I learned this the hard way last year. If you're hunting in an area with lots of bear activity, it's a great idea to stash your food and water up in a tree. I like to wrap everything in a tarp and tie it between two trees. Don't just tie it up in one tree but tie it in between two trees at least 15 feet in the air. I thought I had my backpacking camp's food supply stashed pretty well last year. I returned to camp during the first weekend of archery to find all my food destroyed. Make sure...