Flashback to Maui in December: Annually humpback whales swim from Alaska and British Columbia to Hawaii, where the Auau Channel between Maui, Molokai, and Lanai is a hot spot. It's about 2,000 miles. The length of their migration isn't even the most amazing thing about it though: Once they leave their northern homes, they don't eat. AT ALL. Depending on how long a humpback stays in Maui, they can go between two and five MONTHS without eating. They can lose between 1/3 and 1/2 of their body weight. || Back in their northern homes, humpbacks can eat up to 4,400-5,500 POUNDS of food a day.