Conspecific and heterospecific behavioural discrimination of individual odours by mound-building mice.

We have tested the ability of male mound-building mice, Mus spicilegus, to discriminate on the basis of their social odours a) two males of their own species; and b) two males of the house mouse, Mus musculus domesticus. An habituation-dishabituation procedure was used. An experimental animal was presented with the scent from the same stimulus animal for four trials; on the fifth trial, scent from a second stimulus animal was presented. Male Mus spicilegus were able to discriminate the olfactory signatures of two mound-building mouse males but did not discriminate between the olfactory signatures of two house mouse males. The lack of inter-specific individual recognition is discussed in terms of specificity and attractive value of odour cues.