A. M. Sibbald

Sociability and the willingness of individual sheep to move away from their companions in order to graze

A. Sibbald, R. Hooper, A. M. Sibbald, 2004 .

Consistency of animal order in spontaneous group movements allows the measurement of leadership in a group of grazing heifers

Bertrand Dumont, Alain Boissy, A. Sibbald, 2005 .