Are birds reptiles?

Answer

Birds are considered reptiles under the phylogenetic classification system. This method of categorizing organisms was developed in the 1940s and is based on common ancestry.

In phylogenetics, all animals, including birds, mammals and dinosaurs, that have genetic connections to early reptiles are reptiles. Birds are traced back to the group of feathered dinosaurs that did not die off during the massive dinosaur extinction 65 million years ago. Over time, these dinosaurs evolved into birds. However, in an 18th century classification scheme, the Linnaean system, organisms are grouped together based on common traits. Since reptiles are cold-blooded and have scales, birds do not fall into this category following the Linnaean system.

Q&A Related to "Are birds reptiles?"
Both birds and reptiles reproduce by laying eggs, for the most part. Many species of reptiles and birds also feature ridges in their mouths or beaks instead of teeth.
http://www.ask.com/web-answers/Science/Other/how_a...
Maybe the most visible difference between reptiles and birds is what covers their skin. Reptiles are covered in hard scales and birds are covered in feathers. However, as N.S. Proctor
http://www.ehow.com/facts_6859467_compare-reptiles...
Birds are warm blooded and have feathers whereas reptiles are cold blooded and have scales.
http://wiki.answers.com/Q/How_are_birds_and_reptil...
Birds and modern day reptiles share a common ancestor that would also be considered a reptile. The term 'reptile' is polyphyletic so technically also includes birds and mammals.
http://www.quora.com/How-are-birds-and-reptiles-re...
1 Additional Answer
Ask.com Answer for: are birds reptiles
Birds belong to the Class Aves.
Birds are vertebrates with feathers, modified for flight and for active metabolism. Birds are a monophyletic lineage, evolved once from a common ancestor, and all birds are related through that common origin.
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