The parameters of the reduced general linear models examining the effects of species richness, body size, brain size and attractiveness on dependent variables reflecting the representation of mammalian species in WZC.

a) Proportion of extant species kept in WZC.
b) World zoo population size per species in WZC.
c) Proportion of zoos keeping the species.
d) Individuals per Zoo Keeping the species.
The results of the phylogenetically adjusted analyses (multiple regression of independent contrasts performed through the origin) are also included. For the definition and transformation of the variables see under the Material and methods section.