MCSs of two different species of rats, in cages side by side. MCSs and CSs of same two rats together in one cage. CS to MCS of brown rat moving into white rat's cage. MCS to ZOOM IN on a brown rat climbing the walls of the cage. MCS of white rat in same cage with two brown rats. CSs of white rat. MCS to CS of brown rat (Norvegicus) resting beside white rate. MCS of brown rat. MCSs of white and brown rats side by side in different cages, cleaning themselves. CS and PAN from white rat to brown rat. CSs of rats being manipulated with stick from one coloured box to another. LASs of rats moving from one box to another while somebody removes coloured tops of boxes. MCSs of Japanese man to ZOOM on his hands holding a small baby rat, in last shot he is holding the rat by the tail.