|Polar bears spend the winter on the ice floes of Hudson Bay hunting seals. As the ice melts and current takes it south, the bears are eventually deposited southeast of Churchill for the summer. They spend the summer in walking hibernation, they are slow then, and lazy, and living off their winter fat. As the air cools, and their winter fat is used up, they follow the coast north west, looking for the frozen ice floes so they can fatten back up on their favorite food, seals. The town of Churchill is on that coastline they are following to the north west.