Humpback whale mother pushes her sleeping calf to surface, Maui, Hawaii, USA
Humpback whale mother pushes her sleeping calf to surface, Maui, Hawaii, USA (© Ralph Pace/Minden Pictures)
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Winter is calving season, when thousands of humpback whales swim to the warm waters off Hawaii, making them a common sight from November until April. Because they're known to hang around near the ocean's surface, breaching or slapping the water with their tails, humpbacks are a favourite of whale watchers everywhere.
© Ralph Pace/Minden Pictures