How can the sperm whale go six months without eating?

Sperm whales can go for extended periods without eating due to their ability to store energy in the form of fat, primarily from blubber. They also have a slow metabolism, which allows them to conserve energy when food is scarce. During these fasting periods, they rely on their fat reserves until they can find food again, typically deep-sea squid, their primary diet. Additionally, they can enter a state of reduced activity to minimize energy expenditure.