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Leaver, L. A., Hopewell, L., Caldwell, C., & Mallarky, L. (2006). Audience effects on food caching in grey squirrels (Sciurus carolinensis): evidence for pilferage avoidance strategies. Animal Cognition, 10(1), 23–27. doi:10.1007/s10071-006-0026-7 
10.1007/s10071-006-0026-7