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A stimulus that releases a specific behavior pattern in an animal.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
releaserany stimulus that gives rise to an instinctive act. For example, the red breast of a male robin causes another male to attack it.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005