Curious Naturalists

Penguin Education A Division of Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books Inc, 71 10 Ambassador Road, Baltimore, Md 21207, USA Penguin Books Australia Ltd, Ringwood, Victoria, Australia Penguin Books Canada Ltd, 41 Steelcase Road West, Markham, Ontario, Canada

First published by Country Life Ltd, 1958 Revised edition published by Penguin Education, 1974

Copyright © Niko Tinbergen, 1958, 1974

Designed by Arthur Lockwood

Printed in Great Britain by Fletcher & Son Ltd, Norwich

This book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, re-sold, hired out, or otherwise circulated without the publisher’s prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser