Frommammal +‎-dom.

mammaldom (uncountable)

1. (rare) The condition of being amammal.
   • 1951, Alan Devoe,This Fascinating Animal World, page 4:

     The whole of this vastmammaldom which so dwarfs us is itself no more than a tenth of the entirety of the vertebrates (the backboned animals).

   • 2007 February 20, Natalie Angier, “A Mammal in Winter With a Furnace of Her Own”, inNew York Times‎^[1]:

     At the museum, visitors are reminded thatmammaldom did not confer any major advantages on its earliest practitioners.

   • 2009, Christopher McDougall,Born to Run, page214:

     But why, in allmammaldom, would a jackrabbit need a spring-loaded belly?

• reptiledom

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