By William Etkin

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Social Life in the Animal World. New York: Harcourt Brace & Co. Armstrong, E. 1947. Bird Display and Behavior. New York: Oxford Uni- versity Press. G. 1953. Behavioral factors affecting social structure in the Alaska fur seal. In: J. B. ), Trans. Eighteenth No. Amer. Wildlife Conference. : Wildlife Management Institute. Bartholomew, Burt, W. mals. /. 1943. Territoriality and Mammal, home range mam- 24: 346-52. Carpenter, C. R. 1942. Characteristics of social behavior in primates. Trans. Y. Acad.

For example, a comparison was made between two groups of hens allowed to stabilize their social structure and two in which individuals were being interchanged frequently so that the social structure never could settle down (Guhl, 1953). The stable groups pecked less, ate more, gained more weight, and laid more eggs than did the others. When the least CO-OPERATION AND COMPETITION IN SOCIAL BEHAVIOR welfare of the individual is considered, it is also found 21 that, in flocks kept on short rations, the dominants secured more food than did the subordinates; indeed, top dominants gained vi^eight v^hile subordinates starved.

The Herring Sons & Co. Gull's World. London: William Collins WILLIAM ETKIN Neuroendocrine Correlation in Vertebrates Introduction In this chapter we shall discuss aspects of the nervous and endocrine systems which will be directly useful as background information in reading the subsequent chapters, particularly those dealing with experimental analyses. We shall assume that the reader is famihar with the elementary physiology of these systems as conventionally dis- cussed in college biology or psychology texts and shall stress those topics in which newer knowledge of the nervous or endocrine system has contributed insights relevant to the modern analysis of behavior.

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