Across America, exceptions occur along the Pacific coast where spawning salmon are available in some seasons and in northern Labrador where lemmings were 34 percent of the diet one year.
(see video below)
Around Ely, researchers found that bears get most of their animal protein from ant brood, hornet larvae, tent caterpillars, march fly larvae, grubs (especially June beetle grubs), and snow fleas (Collembola). Bears occasionally found bird nests (mostly ground nests) and readily ate the eggs and featherless hatchlings, but they generally rejected older, feathered hatchlings. They also rejected snakes, turtles, frogs, toads, and salamanders.
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Most bears around Ely eat no fish unless they live near a stream where white suckers (Catostomus commersoni) spawn in spring. They usually pass up non-spawning fish, especially if berries and nuts are available. However, when preferred foods are scarce, campers can attest that bears will eat fish remains.
What bears eat depends upon what else is available—or is not available.
Meat is a very small part of the diet around Ely except in late May and early June when fawns are born. Researchers who walk with bears in late May and June watch bears catch up to 4 fawns. The bears don’t seem to actively hunt fawns. Instead, they search for ant colonies at that time of year. But if a bear happens upon a fawn, it stops searching for ant pupae, sniffs out the fawn, and pounces on it. The first thing they ingest is the high-fat milk in the stomach. Newborn fawns make captures easy by lying still. However, once they reach about 10 days of age they change escape tactics. When bears approach, they get up and ran and easily escape. Black bears lack the agility of dogs and cats to catch dodging animals. The bears soon ignore the scent of fawns until the next spring when a new batch of catchable fawns is born.
The 3 main reasons meat is such a small part of bear diets around Ely are that
1. It is generally not a favorite food as evidenced by the fact that black bears around Ely usually ignore carcasses (fresh or rotting) they find in summer, especially if nuts and berries are available. They do eat carcasses in spring or fall.
2. Black bears are poor predators.
3. Little carrion is available around Ely. By the time bears emerge from dens in April, wolves and ravens have cleaned up most of the deer and moose that died over winter, leaving only bones for bears to gnaw on. In fall, most bears are in dens before hunters begin leaving gut piles throughout the northwoods.
Nevertheless, individual habits and food preferences vary. Black bears have broken into beaver lodges, have preyed on beavers on land, and a well-fed bear tried to break into a shed containing a beaver carcass. Black bears have been seen chasing adult deer in Minnesota and herds of elk in Yellowstone National Park. Black bears (about 1 out of a million black bears) have preyed on 60 people between 1900 and 2007.