Crown Group
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Crown Group
In phylogenetics In biology Biology is the natural science that studies life and living organisms, including their anatomy, physical structure, Biochemistry, chemical processes, Molecular biology, molecular interactions, Physiology, physiological mechanisms ..., the crown group or crown assemblage is a collection of species In biology, a species is the basic unit of biological classification, classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individu ..., composed of the living representatives of the collection, the most recent common ancestor In biology Biology is the natural science that studies life and living organisms, including their anatomy, physical structure, Biochemistry, chemical processes, Molecular biology, molecular interactions, Physiology, physiological mechanisms ... of the collection, and all descendants of the most recent co ...
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Birds
Birds are a group of s constituting the Aves , characterised by s, toothless beaked jaws, the of eggs, a high rate, a four-chambered , and a strong yet lightweight . Birds live worldwide and range in size from the to the . There are about ten thousand living species, more than half of which are , or "perching" birds. Birds have whose development varies according to species; the only known groups without wings are the extinct and s. Wings, which evolved from s, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including s, s, and diverse island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly s and some , have further evolved for swimming. Birds are a group of s and constitute the . Likewise, birds are considered s in the modern sense of the term, and their closest living relatives are the ns. Birds are descen ...
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Neornithes
Birds are a group of warm-blooded vertebrate Vertebrates () comprise all species of animal Animals (also called Metazoa) are multicellular eukaryotic organisms that form the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic ma ...s constituting the class Class or The Class may refer to: Common uses not otherwise categorized * Class (biology), a taxonomic rank * Class (knowledge representation), a collection of individuals or objects * Class (philosophy), an analytical concept used differently f ... Aves , characterised by feather Feathers are epidermal growths that form a distinctive outer covering, or plumage Plumage ( "feather") is a layer of feather Feathers are epidermal growths that form a distinctive outer covering, or plumage, on dinosaurs, both avia ...s, toothless beaked jaws, the laying Laying is the act of making equipment level. It usually involves moving equipment in ...
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