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These natural history guides have been developed in the hope that young people and anyone with a budding interest in natural history will take up the challenge to learn the secrets of southern Africas fascinating fauna and flora. These little guides are an invaluable resource for the beginner, providing information at a glance through superb photographs, maps and easy-to-read text. • handy pocket size
Author Sean Fraser, a graduate of Journalism and Media Studies from Rhodes University, Grahamstown, South Africa, is a full-time editor and writer. For three years he was the Managing Editor of the Globetrotter Travel Series, a collection of acclaimed guides, atlases and travel maps focusing on a wide range of international travel destinations, including those of Africa, Europe, Southeast Asia and the Americas. He was also Associate Editor of Discover Africa magazine and Contributing Editor on Africa – Environment and Wildlife (now Africa Geographic). He is also the author of no fewer than eight glossy coffee-table volumes on the people, wildlife and natural splendour of South Africa, three natural history guides aimed at creating conservation awareness among young readers, particularly in Africa, as well as National Geographics 336-page African Adventure Atlas, which explores the seemingly endless opportunities for travel and adventure on the continent. Based in Cape Town, Sean Fraser currently enjoys a freelance career in book and magazine publishing, specialising in travel and political biography.
Whales and dolphins are mammals, that is to say, warm-blooded animals with backbones that breathe air and suckle their young. Millions of years ago, their ancestors lived on land but, because they now spend all their time in water, their bodies have adapted to living in the sea and are streamlined much like those of fish. Because they need to breathe air, whales and dolphins must be able to hold their breath for a long time underwater - some of the really big whales can hold their breath for over an hour! Because it is so dark underwater, whales and dolphins do not rely on their eyesight, but rather use sound to help them find their way, by I sending out sound waves, which bounce off other objects. If a whale or dolphin detects an echo, it knows that there is something in the way. This is known as echolocation. Whales and dolphins are known as cetaceans - about 79 species occur around the world, 38 of which are found in the waters off southern Africa’s coast.
Whales and dolphins |