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Collins New Naturalist Library
H. R. Hewer
A comprehensive account of the seal’s migratory patterns, methods of hunting for food, movements and patterns of reproduction.While seals are a perennial favourite among visitors to zoos for their playful and engaging behaviour, less is known about their actions in natural habitats. Based on extensive field observations, this thoroughly illustrated volume in The New Naturalist Series is one of the most authoritative studies of its kind. The late Professor Hewer shows how recent discoveries for determining the age of seals have greatly contributed to research in the subject and he presents a comprehensive account of the seal’s migratory patterns, methods of hunting for food, movements and patterns of reproduction. As the large colonies of seals indigenous to British waters constitute and important segment of the world’s seal population, Professor Hewer’s findings will be helpful to all interested in seal behaviour, and conservation.Professor Hewer researched seal behaviour for over twenty years, did extensive field work in seals and published several articles on his findings. He was Emeritus Professor at the University of London and served with the British government’s Ministry of Agriculture and Ministry of Food.
COPYRIGHT (#ulink_25347cc6-9d89-53c2-ab05-5e922ef91608)
William Collins
An imprint of HarperCollinsPublishers Ltd 1 London Bridge Street London SE1 9GF WilliamCollinsBooks.com (http://WilliamCollinsBooks.com)
First published 1974
This eBook edition published by William Collins in 2019
© H. R. Hewer 1974 The author asserts his moral rights to be identified as the author of this work
A catalogue record for this book is available from the British Library.
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Source ISBN 9780007311118
Ebook Edition © FEBRUARY 2019 ISBN: 9780007406463
Version: 2019-02-13
NOTE TO READERS (#ulink_9109b4fc-fd3b-5749-a531-b9b37168be98)
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Page numbers taken from the following print edition: ISBN 9780007311118
EDITORS:
Margaret Davies C.B.E. M.A. Ph.D.
Sir Julian Huxley F.R.S. M.A. D.Sc.
John Gilmour M.A. V.M.H.
Kenneth Mellanby C.B.E. Sc.D.
PHOTOGRAPHIC EDITOR:
Eric Hosking F.R.P.S.
The aim of this series is to interest the general reader in the wild life of Britain by recapturing the inquiring spirit of the old naturalists. The Editors believe that the natural pride of the British public in the native fauna and flora, to which must be added concern for their conservation, is best fostered by maintaining a high standard of accuracy combined with clarity of exposition in presenting the results of modern scientific research.
CONTENTS
COVER (#u78dfc492-ea83-5668-be38-60443a12e7db)
TITLE PAGE (#u00dd24d4-9c60-5b70-b837-cb9da92d39e0)
COPYRIGHT (#ulink_f27f2bb7-398f-5f9e-ba2d-f573cf1b7acc)
NOTE TO READERS (#ulink_adffeadd-361d-5917-a833-9b650bc48b64)
PLATES (#ulink_b9d5d2c4-94fa-5a16-a9c8-7315c855c319)
FIGURES (#ulink_315576eb-e44f-5c2b-9d06-7e43131afc43)
EDITORS’ PREFACE (#ulink_3270bb3b-11d6-59bf-b408-875f055b1c63)
AUTHOR’S PREFACE (#ulink_ddc49913-1ba5-5093-9190-eef6d351bc60)
1. The Pinnipedia (#ulink_bdc245dc-f8a3-5ca3-b9ee-e68e7d1f597b)
2. The grey seal – introductory (#ulink_f899965b-5d85-56cf-a731-5cbd3ba2c442)
3. The grey seal – age determination, longevity and maturity (#litres_trial_promo)
4. The grey seal – reproduction (#litres_trial_promo)
5. The grey seal – annual moult and spring behaviour (#litres_trial_promo)
6. The grey seal – feeding and food; pre-breeding assemblages (#litres_trial_promo)
7. The grey seal – the breeding rookery: cow and pup (#litres_trial_promo)
8. The grey seal – the breeding rookery: bulls, territory and mating (#litres_trial_promo)
9. The grey seal – moulters, dispersal, marking experiments and later movements (#litres_trial_promo)
10. The grey seal – population dynamics, mortality and pregnancy rates (#litres_trial_promo)
11. The common seal – introductory (#litres_trial_promo)
12. The common seal – reproduction, pup, moulting, food and numbers (#litres_trial_promo)
13. Other species of pinnipede (#litres_trial_promo)
14. Conservation of British seals (#litres_trial_promo)
PICTURE SECTION (#litres_trial_promo)
APPENDICES (#litres_trial_promo): A Classification of Pinnipedia (#litres_trial_promo)
B Breeding rookeries of grey seals (#litres_trial_promo)
C Life-tables for grey seal cows and bulls (#litres_trial_promo)
D Farne Island seal counts, 1956–1968 (#litres_trial_promo)
E Research and world conservation of seals (#litres_trial_promo)
FOOTNOTES (#litres_trial_promo)
BIBLIOGRAPHY (#litres_trial_promo)
INDEX (#litres_trial_promo)
ACKNOWLEDGEMENTS (#litres_trial_promo)
ABOUT THE PUBLISHER (#litres_trial_promo)
PLATES (#ulink_092927e2-c041-5a4b-9957-e5944b009d5d)
1. Fur-seals fanning themselves (C. Bertram) (#litres_trial_promo)
Head of grey seal (#litres_trial_promo)
Head of Californian sea-lion (#litres_trial_promo)
2. Porth Laoug, Ramsey Island, Pembrokeshire (#litres_trial_promo)
Beach on Eilean nan Ron, Oronsay, Inner Hebrides (#litres_trial_promo)
3. Shell-sand beach and herd of grey seals, Shillay, Outer Hebrides (#litres_trial_promo)
Breeding rookery in wallows, Shillay, Outer Hebrides (R. Atkinson) (#litres_trial_promo)
4. Breeding rookery in central Fianuis, North Rona (J. M. Boyd) (#litres_trial_promo)
Ring-marking a moulter, North Rona (J. M. Boyd) (#litres_trial_promo)
5. Shore rookery, Muckle Greenholm, Orkney (J. Woolston) (#litres_trial_promo)
Breeding rookery, Staple Island (and Brownsman), Farne Islands (J. C. Coulson) (#litres_trial_promo)
6. Aerial view of Gasker, Outer Hebrides (W. St. C. Reid in Boyd, J. M. 1957) (#litres_trial_promo)
Bull and cow grey seals at wallow, North Rona (#litres_trial_promo)
7. Territorial grey seal bull, Brownsman, Farne Islands (#litres_trial_promo)
Breeding grey seal cow, Brownsman, Farne Islands (#litres_trial_promo)
8. Longitudinal section of root of canine tooth of grey seal (#litres_trial_promo)
Two canine teeth from 1st year grey seals (#litres_trial_promo)
Two adult canine teeth (bull and cow) grey seals (#litres_trial_promo)
Cement layers in tooth of 8-year-old grey seal (#litres_trial_promo)
Cement layers in tooth of 18-year-old grey seal (#litres_trial_promo)
9. Section of immature testis of grey seal (#litres_trial_promo)
Section of mature but resting testis of grey seal (#litres_trial_promo)
Sections of mature and active testes of grey seal (#litres_trial_promo)
10. Section of immature epididymis of grey seal (#litres_trial_promo)
Section of mature but resting epididymis of grey seal (#litres_trial_promo)
Section of mature and active epididymis of grey seal (#litres_trial_promo)
Abdominal testis in ‘82-day’ foetus grey seal (#litres_trial_promo)
11. Section of ovary with developing oocytes, grey seal (#litres_trial_promo)
Right and left ovaries in section, grey seal (#litres_trial_promo)
12. Free blastocyst in utero, grey seal (R.Cox) (#litres_trial_promo)
Young embryo (c. 31 days), grey seal (#litres_trial_promo)
Early foetus (c. 55 days) in utero, grey seal (#litres_trial_promo)
13. Early male foetus (c. 62 days), grey seal (#litres_trial_promo)
Young male foetus (c. 72 days), grey seal (#litres_trial_promo)
Later male foetus (c. 113 days), grey seal (#litres_trial_promo)
