Ungulates (antelopes, deer and relatives) have some of the most diverse social systems among mammals. To understand evolution ungulate organization, Jarman (1974) proposed an ecological scenario how distribution resources, habitat feeding style may influenced organization. Although Jarman's makes intuitive sense remains a textbook example evolution, it has not been scrutinized using modern phyl...

Shrews and their close relatives (order Eulipotyphla) are typically considered to be solitary. This impacts our understanding of mammalian social evolution: (i) the ancestor of mammals is believed to have been shrew-like, and even though Eulipotyphla are not more basal than other mammalian orders, this might have been one reason why the first mammals have been assumed to be solitary-living; (ii...