| Neornithes |
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| CATEGORIES ABOUT MODERN BIRDS | |
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Modern birds (subclass '''Neornithes''') are the members of class Aves that have survived into recent times and have coexisted with Human s. Modern birds are Characterised primarily by their toothless Beak s, as most Prehistoric Bird groups posessed teeth. Many species of modern bird undertake long distance Annual Migrations , and many more perform shorter more irregular movements. They are primarily Socially Monogamous , with engagement in Extra-pair Copulations being common in some species; other species have Polygamous or Polyandrous breeding systems. Eggs are usually laid in a Nest and Incubated and most birds have an extended period of parental care after hatching. TAXONOMY Modern birds are divided into two evidence supporting a Tertiary radiation. Attempts made to reconcile the molecular and fossil evidence have proved controversial.Brown J, Payn B, & Mindell D (2006) "Nuclear DNA does not reconcile 'rocks' and 'clocks' in Neoaves: a comment on Ericson ''et al.'' ''Biology Letters'' 3 1-3 The classification of modern birds is a contentious issue. and Dinosaur Classification . Classification This is a list of the taxonomic orders in the subclass Neornithes, or modern birds. The List Of Birds gives a more detailed summary of these, including families. Subclass Neornithes Paleognathae :
Neognathae :
Note: This is the traditional classification (the so-called Clements order). A radically different classification based on molecular data has been developed (the so-called Sibley-Monroe classification or Sibley-Ahlquist Taxonomy ). This has influenced taxonomic thinking considerably, with the Galloanserae proving well-supported by recent molecular, fossil and anatomical evidence. With increasingly good evidence, it had become possible by 2006 to test the major proposals of the Sibley-Ahlquist taxonomy, with favorable results (see for example Charadriiformes , Gruiformes or Caprimulgiformes ). Phylogeny Basal divergences of modern birds based on the Sibley-Ahlquist Taxonomy .
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