Bears are among the largest carnivores, characterized by stocky bodies, short tails, long, square snouts, and round ears. North American bears are common to wooded areas, where streams can provide an opportunity to fish year round. Although they possess fierce teeth and claws, bears are opportunistic and omnivorous eaters, meaning they will dine on whatever is available and convenient: trout, berries, insects, roots, and even garbage left by human campers. Some species also hibernate during winter, escaping into dens to sleep away the colder months.