Question this calculation and you're worse than Hitler: A polar bear allegedly needs to eat more than 300 2-kilogram snow geese (1,320 pounds) to power itself for one hour of running

Arctic ecology: Sacred geese | The Economist

...a quick calculation comparing the cost of doing so with the energetic gain from success suggests such hunts are not usually worth the effort.  To make a profit, the argument goes, a polar bear weighing 320kg (700lb, the average for an adult) must, if hunting a 2kg goose, make its kill in less than 12 seconds.