Polar bears are the most carnivorous of all bear species and feed primarily on ringed seals, but will also eat bearded seals, harp seals, hooded and harbor seals, when available. They can also eat larger prey species such as walrus, narwhal, and beluga, and will readily scavenge on marine mammal carcasses. Polar bears can enter carnivore lethargy and survive long periods without food due to their fat stores. They have a substantial appetite and can eat 100 pounds of seal blubber in one feed. Polar bear cubs drink their mother’s milk, which is rich in fat, for the first three to four months. Their first solid meal is generally around three to four months when their mother hunts on the open ice for the first time since giving birth. Polar bear cubs then eat portions of meat and seal blubber to build up their own fat reserves.