Linked from
The 43 pages that link to Mammalia, each with the reason it gives.
TherapsidaBroader topic: Mammals are living descendants within the therapsid lineage.
SynapsidaBroader topic: Mammalia is the surviving branch nested within the much broader Synapsida.
EndothermBroader topic: Living mammals are one of the two major endothermic vertebrate groups.
Class (biology)Broader topic: Mammalia is a familiar named class containing diverse mammal orders.