Mammals are the only living members of the larger clade Synapsida, which has a fossil record spanning 320 Ma. Despite the fact that much of the ecological diversity of mammals has been considered in ...
http://onlinelibrary.wiley.com/doi/10.1111/jeb.12161/abstract,http://onlinelibrary.wiley.com/store/10.1111/jeb.12161/asset/jeb12161.pdf?v=1&t=hgr3iprp&s ...