It is interesting that the character displacement observed in the quoll guild is expressed as character convergence rather than the divergence intimated in Brown and Wilson's (1956) original definition.
The overall result is character convergence. This combination of size correlated with latitude but mediated by size relationships with congeners, that is, character displacement, has also been demonstrated in congeneric foxes (Dayan et al.
Territorial mimicry (a preferred term for Cody's [1969, 1973] "character convergence
"; also see Murray ) is unlikely because pulmonate-snail visual acuity is quite low (Kerkut and Walker 1975), no intraspecific shell contact has ever been observed in these or any other polygyrids (G.