Along the Waianae coast of Oahu in early morning hours, spinner dolphins gather in shallow inshore waters of Makua Bay, Pokai Bay, and Kahe Point. Spinner dolphins (Stenella longirostris) derive their name from their often acrobatic leaps from the water. These areas are used by the dolphins for resting, nursing, and social interactions. Dolphins are often observed milling in these areas in groups ranging from two to a hundred or more individuals. On many occasions, individual dolphins may display surface-active behaviors.
The main Hawaiian lslands are the primary winter reproductive area for the majority of North Pacific humpback whales. Humpback whales are most abundant in the waters of the four-island region consisting of the islands of Maui, Molokai, Lanai and Kahoolawe, and in Penguin Bank, a shallow bank extending some 40 km southwest of west Molokai. The Big Island, on average, showed the earliest peak in abundance of whales. Population numbers on Maui tend to peak somewhat later than on the Big Island, followed in turn by later peaks in Penguin Bank and Oahu. Altogether, peak abundance follows a successively later date from the southeast to the northwest, with only Kauai seemingly being independent of this trend.
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