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Each winter, some two-thirds of the North Pacific humpback whale population (about 4,000–5,000 animals) migrate over 3,500 miles from the icy Alaska waters to the warm Hawaiian ocean to mate and, the following year, give birth to and nurse their calves. Recent reports indicate that the whale population is on the upswing—a few years ago one even ventured into the mouth of Hilo Harbor, which marine biologists say is quite rare. Humpbacks are spotted here from early December through the end of April, but other species, like sperm, pilot, and beaked whales as well as spinner, spotted, and bottlenose dolphins, can be seen year-round. If you take a morning cruise, you're more likely to see dolphins.