BioConcepts

birdsὀρνίθες (gr.); Aves (lat.); Vögel (ger.)

• Feathered vertebrate animals: members of the second class (Aves) of the great Vertebrate group, the species of which are most nearly allied to the Reptiles, but distinguished by their warm blood, feathers, and adaptation of the fore limbs as wings, with which most species fly in the air. (OED)
  category animal

  c. -350 (BC)

  Γένη δὲ μέγιστα τῶν ζῴων, εἰς ἃ διῄρητα ιτἆλλα ζῷα, τάδ’ ἐστίν, ἓν μὲν ὀρνίθων, ἓνδ’ ἰχθύων, ἄλλο δὲ κῆτος. Ταῦτα μὲν οὖν πάντα ἔναιμά ἐστιν. [Ein Theil der Thiere lässt sich in grosse Abtheilungen bringen; dergleichen sind die Vögel, die Fische, die Wale, welche sämmtlich Blutthiere sind.]

  Aristotle (c. 350 BC), Historia animalium 490b7-10 (transl. H. Aubert and F. Wimmer 1868).

  1735

  Aves. Corpus plumosum. Alæ duæ. Pedes duo. Rostrum osseum. Feminæ oviparæ.

  Linnaeus, C. (1735). Systema naturae: [Regnum Animale].