DAVID VAUGHAN / SCIENCE PHOTO LIBRARY DAVID VAUGHAN / SCIENCE PHOTO LIBRARY
Humpback whales exhaling in calm waters off the Antarctic Peninsula. When a humpback whale (Megaptera novaeangliae) exhales, air is released from the whale's blowhole, the nostril on the top of its head. The humpback whale may reach a length of 15 metres and weigh up to 27 tonnes. It is known for the impressive leaps that it makes out of the water and for its long vocalisations, which are more elaborate than in any other known whale song. Humpback whales are found in the deep waters of the coastal regions of all the world's oceans. They are one of the whale species most threatened with extinction.
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