ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Humpback whales (Megaptera novaeangliae) swimming. This is a calf (top) and its mother. The humpback whale 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. A humpback whale can reach around 27 tonnes in weight and 15 metres in length. It is found in deep water near coasts in all of the world's oceans. The whales are accompanied by remoras, which hang off them with dorsal fins modified into suckers, feeding on parasites and food scraps. Photographed in the Indian Ocean off Madagascar.
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