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Origin and Aims of the Study
The Nature and Consequences of Social Behavior and Social OrganizationContinued
Experimental Procedure and the Gathering of Data
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activity adjoining adult rats approximately Army Signal Corps behavior broad-winged hawk burrow sealing burrow system chambers cloth sack colony corner developed direction distance drain tile East Alley entrances entry environment excavated dirt exit exposed to traps feces feet of trails female food hopper Food Pen frequency garbage geotropically goals goldenrod growth harborage boxes inches indicated individual initial Internuncial January 24 kinesthetic litter median barrier fence mound movement nest cavity nesting material North Norway rat number of feet number of rats observed olfaction outer limiting Passage Path pelage marking Photograph by U.S. placed point of orientation population position possible predators recorded response Rodent Ecology Project routes of travel shown in figure source of food South Alley Burrow space structure subnivian trails surface terminal thigmotropic thiourea tion trapping period triangular areas tunnel segments U.S. Army Signal utilized vertical cues vertical objects visual perception West Alley