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Day-time time budgets of pregnant mares housed in tie stalls: a comparison of draft versus light mares[J] . G. Flannigan,J.M. Stookey.  Applied Animal Behaviour Science . 2002 (2)
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Group-size effects on vigilance: a search for mechanisms[J] . Guy Beauchamp.  Behavioural Processes . 2003 (3)
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Grazing and vigilance by Soay sheep on Lundy island: Influence of group size, terrain and the distribution of vegetation[J] . L. Hopewell,R. Rossiter,E. Blower,L. Leaver,K. Goto.  Behavioural Processes . 2005 (2)