ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Humpback whales (Megaptera novaeangliae) swimming underwater. The smaller whale is a juvenile swimming with an adult, which explains the difference in size. The humpback whale can grow to 27 tonnes in weight and 15 metres in length. It has up to 350 large bristly baleen plates hanging down from its jaws. It feeds by swallowing sea water and then pressing its tongue against the plates, pushing the water out and trapping krill and fish. The humpback whale is found in deep water near coasts in all of the world's oceans. Photographed in the Pacific Ocean, off Rurutu Island in the Austral Archipelago, French Polynesia.
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