Series Editor: Sorrel Pitts
Written by Rachel Godfrey
LADYBIRD BOOKS
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First published 2018
Updated version reprinted 2023
Text copyright © Ladybird Books Ltd, 2018, 2023
All images copyright © BBC, 2006
Cover photograph by Tom Hugh-Jones copyright © BBC NHU, 2016
BBC and BBC Earth (word marks and logos) are trade marks of the
British Broadcasting Corporation and are used under licence.
BBC logo © BBC 1996. BBC Earth logo © 2014.
ISBN: 978
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0
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241
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58035
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6