Sentinel animal
noun
1.
an animal that is placed in a given environment and then monitored to find out if an infectious disease or other harmful agent is present in that environment
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noun, plural sentries. 1. a soldier stationed at a place to stand guard and prevent the passage of unauthorized persons, watch for fires, etc., especially a sentinel stationed at a pass, gate, opening in a defense work, or the like. 2. a member of a guard or watch. noun (pl) -tries 1. a soldier who […]