Avialae
|-?Rahonavis ostromi
|-?Unenlagia comahuensis
   |
   |-Aves
      |-Archaeopterygiformes
         |-Archaeopteryx lithographica
         |-Archaeopteryx bavarica
         |
         |-?Yandangornis longicaudus
            |
            |-Pygostylia
               |-Confuciusornithidae
               |  |-Changchengornis hengdaoziensis
               |  |-Confuciusornis sanctus
               |  |-Confuciusornis chuonzhous
               |  |-Confuciusornis dui
               |  |-Confuciusornis suniae
               |  |-Proornis koreae
               |
               |-?Zhyraornithidae
               |  |-Zhyraornis kashkarovi
               |
               |-?Jibeinia luanhera
               |-?Longipteryx chaoyangensis
               |-?Noguerornis gonzalezi
               |-?Protopteryx fengpingensis
               |
               |-Ornithothoraces
                  |-?Vorona berivotrensis
                  |
                  |-Euornithes
                     |-?Gansuiformes
                     |  |-Gansus yumensis
                     |
                     |-?Ambiortiformes
                     |  |-Ambiortus dementjevi
                     |  |-?Otogornis genghisi
                     |
                     |-?Patagopterygiformes
                     |  |-Patagopteryx deferrariasi
                     |  |-?Gargantuavis philoinos
                     |
                     |-?Chaoyangiiformes
                     |  |-Chaoyangiidae
                     |  |  |-Chaoyangia beishanensis
                     |  |
                     |  |-?Songlingornithidae
                     |     |-Songlingornis linghensis
                     |
                     |-?Liaolingornis longiditrus
                     |-?Yanornis martini
                     |-?Yixianornis grabaui
                     |
                     |-Ornithohurae
                     |  |-Apsaravis ukhaana
                     |  |  |
                     |  |  |-Carinatae
                     |  |     |-Ichthyornithiformes
                     |  |     |  |-Ichthyornis dispar
                     |  |     |  |-Ichthyornis antecessor
                     |  |     |  |-?Apatornis celer
                     |  |     |
                     |  |     |-Limenavis patagonica
                     |  |        |
                     |  |        |-?Lithornithiformes
                     |  |           |-Neornithes (modern birds, for cladogram, see The Dinosauricon)
                     |  |
                     |  |-Hesperornithiformes
                     |     |-Enaliornis barretti
                     |     |-Enaliornis sedgwicki
                     |        |
                     |        |-Pasquiaornis hardiei
                     |        |-Pasquiaornis tankei
                     |           |
                     |           |-Baptornis advenus
                     |           |-Judinornis nogontsavensis
                     |              |
                     |              |-Hesperornithidae
                     |                 |-Asiahesperornis bashanovi
                     |                 |-Parascaniornis stensioi
                     |                    |
                     |                    |-Hesperornithinae
                     |                       |-Hesperornis regalis
                     |                       |-Hesperornis crassipes
                     |                       |-Hesperornis rossica
                     |                       |-Parahesperornis alexi
                     |                       |-?Parahesperornis gracilis
                     |
                     |-Enantiornithes
                        |-?Enantiornithiformes
                        |  |-Enantiornis leadi
                        |  |-Enantiornis martini
                        |  |-Enantiornis walkeri
                        |  
                        |-?Eoenantiornithiformes
                        |  |-Eoenantiornis buhleri
                        |
                        |-?Cuspirostrisornithidae
                        |  |-Cuspirostrisornis houi
                        |  |-?Largirostrisornis sexdentoris
                        |
                        |-?Gobipterygidae
                        |  |-Gobipteryx minute
                        |  |-?Nanantius eos
                        |  |-?Nanantius valifanovi
                        |
                        |-?Sinornithiformes
                        |  |-Cathayornis yandica
                        |  |-Cathayornis caudatus
                        |  |-Sinornis santensis
                        |
                        |-?Iberomesornis romeralli
                           |
                           |-Lectavis brevipedalis
                              |
                              |-Yungavolucris bretincola
                                 |
                                 |-?Concornis lacustris
                                    |
                                    |-Avisauridae
                                       |-Neuquenornis volans
                                       |-Avisaurus archibaldi
                                       |-Avisaurus gloriae
                                          |
                                          |-Soroavisaurus australis

In Archaeopteryx the extra large claw was gone, but it still had the hyperextendable digit, which all the dromaeosaurs
had.

In neornithes there sometimes occur clawed wings (hoatzin hatchlings) and 'killer claws' (cassowary, some eagle species). These
peculiar fetures, along with the strange anatomy of the ostrich, or the appearance of an eagle, make many people speculate in
which dinosaur this bird must be most related to. Sometimes it can look like the eagle must be more related to
dromaeosaurids than a duck, and that an ostrich obviously evolved from Ornithomimids
but this is purely based on outer appearance, and not genetics. All living birds have the same common ancestor.