Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
Count: 28o;94f;139g;10s; ‡2o;4f;17g; †3o;34f;315g;10s
   Subclass †Odontoholcae (Marsh, 1875) Stejneger, 1885 see Cohort Ornithurae Haeckel, 1866
  Count: [†*] †1o;1f;2g;4s
     1 Order †Hesperornithiformes Fürbringer, 1888
    Count: -