And i like how the bears sometimes not attacking you if you stand still
Realistically, bears hunt mainly on scent, not so much on sight & sound.
From animals.mom.com:
"According to the number of scent receptors, the bear has the best sense of smell of all terrestrial mammals. Black bears have been observed to travel 18 miles in a straight line to a food source, while grizzlies can find an elk carcass when it's underwater and polar bears can smell a seal through 3 feet of ice. It's not all about food, though -- male polar bears have been known to trek a hundred miles following the scent of a sexually receptive sow."
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The polar bear (ursus maritimus) could use a bit of a revamp. Currently, all I need do to escape is jump in the water. But the bear got its name because it was so frequently seen in the water...
From Wiki:
"The polar bear is an excellent swimmer and often will swim for days.[70] One bear swam continuously for 9 days in the frigid Bering Sea for 700 km (400 mi) to reach ice far from land. She then travelled another 1,800 km (1,100 mi). During the swim, the bear lost 22% of her body mass and her yearling cub died.[71] With its body fat providing buoyancy, the bear swims in a dog paddle fashion using its large forepaws for propulsion. Polar bears can swim at 10 km/h (6 mph). When walking, the polar bear tends to have a lumbering gait and maintains an average speed of around 5.6 km/h (3.5 mph).[72] When sprinting, they can reach up to 40 km/h (25 mph).[73]"
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Of course, too much realism could ruin the fun - especially when unarmed and being pursued by a hungry bear that, over long distance, can out run and out swim it's prey. Hiding isn't even an option due to it's amazing olfactory sense.
Edit: Broken Wiki link to Seaworld - the info can be found here:
https://seaworld.org/animals/all-about/polar-bear/behavior/
Edit: link to animals.mom.com info:
https://animals.mom.com/creature-sense-smell-3339.html