A seven-year study of tiger shark migration has lent credence to a long-held Hawaiian belief that the danger of shark bites increases in the fall. "Both the timing of this migration and tiger shark pupping season coincide with Hawaiian oral traditions suggesting that late summer and fall, when the wiliwili tree blooms, are a period of increased risk of shark bites," said University of Hawaii researcher Carl Meyer, who co-authored the study. Researchers tagged more than 100 tiger sharks and found that about one quarter of the female sharks return to the islands every year, likely to give birth.

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