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There is much evidence that a variety of animals can judge the relative fighting ability of an opponent on the basis of certain morphological cues such as comb size in domestic fowl. In initial fights, young pigs seem unable to make such judgements. However, they appear to be able to judge the...

Rushen, J.
Kluwer Academic Publishers, Dordrecht, Netherlands
Social stress in domestic animals., 1990, pp 135-143