BioConcepts

mammalsMammalia (lat.); Säugetiere (ger.)

• Animals of the vertebrate class Mammalia, the members of which are characterized by having mammary glands that secrete milk to feed the young. (OED)
  category animal

  1758

  Mammalia hæc & nulla alia mammata Animalia, ex structura, visceribus, organis homini proxima, pleraque Quadrupedia, nobiscum Continentem inhabitant, tanquam inter hostes atrocissimos, dum pauca Pinnata intra Pelagum se subducunt.

  Linnaeus, C. (1758). Systema naturae, 10th ed.: 14.

  1775

  Die Säugthiere

  Schreber, J.C.D. (1775). Die Säugthiere in Abbildungen nach der Natur mit Beschreibungen, Erster Theil. Der Mensch. Der Affe. Der Maki. Die Fledermaus.