which we house them impact on social group dynamics is not known. In this paper the effect
of pen environment on spatial clustering is considered. Twelve groups of four laying hens
were studied under three environmental conditions: wire floor (W), shavings (Sh) and
perches, peat, nestbox and shavings (PPN). Groups experienced each environment twice,
for five weeks each time, in a systematic order that varied from group to group. Video …