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P. Humphreys (1972)
Brief observations on the semen and spermatozoa of certain passerine and non-passerine birds.Journal of reproduction and fertility, 29 3
W. Conway (1967)
The Opportunity for Zoos to Save Vanishing SpeciesOryx, 9
M. Landolt, R. Kocan (1976)
TRANSMISSION OF AVIAN POX FROM STARLINGS TO ROTHCHILD'S MYNAHS, 12
Matthews Matthews (1973)
Some problems facing captive breeding and restoration programmes for waterfowlInt. Zoo Yb., 13
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Effects of Breeding in Captivity on Conflict among Wild RatsJournal of Mammalogy, 50
H. Slatis (1960)
An Analysis of Inbreeding in the European Bison.Genetics, 45 3
Warner Warner (1963)
The Laysan tealCondor., 65
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THE ROLE OF INTRODUCED DISEASES IN THE EXTINCTION OF THE ENDEMIC HAWAIIAN AVIFAUNAThe Condor, 70
R. Moss (1972)
Effects of Captivity on Gut Lengths in Red GrouseJournal of Wildlife Management, 36
Blaauw Blaauw (1904)
On the breeding of some of the waterfowl at Gooilust in the year 1903J. Mammal., 46
Rear Rear, Brown Brown (1976)
A pox?like condition in the Hawaiian goose Branta sandviccmisInt. Zoo Yb., 16
T. Wells (1965)
Grazing in Terrestrial and Marine Environments , edited by D. J. Crisp, British Ecological Society Symposium Number 4 . Blackwell, 63s.Oryx, 8
R. Warner (1963)
RECENT HISTORY AND ECOLOGY OF THE LAYSAN DUCKThe Condor, 65
Moss Moss (1972)
Effects of captivity on gut length in red grouseJ. Wildl. Mgmi., 36
Sclater Sclater (1880)
List of the certainly known species of Anatidae with notes on such as have been introduced into the zoological gardens of EuropeProc. zool. Soc. Land., 180
J. Kear, M. Brown (1976)
A pox‐like condition in the Hawaiian gooseInternational Zoo Yearbook, 16
C. Jarvis (1967)
The Value of Zoos for Science and ConservationOryx, 9
Joseph Waters, Bernard Stockley (1965)
Hibernating Meadow Jumping Mouse on Nantucket Island, MassachusettsJournal of Mammalogy, 46
G. Matthews. (1973)
Some problems facing captive breeding and restoration programmes for waterfowlInternational Zoo Yearbook, 13
a City!â proclaim the posters. Is our natural heritage in each virgin territory at stake? Here we encounter the unknown factor. The truth about what is endangered is ultimately in constant transition, like the essence of all life. Endangered are those whose survival now depends solely on the success of our endeavours to control the abuses of civilisation. Lest the issue be confused by the argument that species rise and fall due to evolutionary processes, let us recall the AUenlHarper definition. Our concern lies with species that are endangered by human activities. To return to my opening thought: there were men, a hundred years ago and more, who tried in their own way to preserve life in all its forms. The conviction they held is as vigorous today as ever, and while it lives, the forces of abuse, if not turned, may yet be held at bayq REFERENCES G. M. (1942):Extinct and vanishing mammals u f the Western hemisphere. Lancaster, Pa: Am. Com. Int. Wildl. Prot. BOYLE, c. L. (1959): The Survival Service Commission. 0 1 1 x 5 : 30-35. COOLIDGE, H. J. (1960):A look at threatened species: foreword. Oryx 5: 1~7-1.58. DIRCKS, w. H. (1886): Introdirctory
International Zoo Yearbook – Wiley
Published: Jan 1, 1977
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