Are birds mammals or reptiles?

Answer

Birds are neither mammals (they don't have mammary glands) nor reptiles (they are not cold blooded), but instead belong in a grouping all their own. The bird group is one of six basic animal groups, with the others being amphibians, fish, invertebrates, mammals and reptiles.

A number of distinct characteristics can be found in birds, beyond having feathers. Birds have a high metabolic rate and a four-chambered heart. They lay eggs and have lightweight bones. Scientists believe that birds evolved approximately 150 million years ago during the Mesozoic Era, and there are now more than 9,000 bird species around the globe.

Reference:
Q&A Related to "Are birds mammals or reptiles?"
neither.its a bird.
http://wiki.answers.com/Q/What_is_bird_a_mammal_or...
The largest # of tetrapod vertebrates, are warm-blooded egg layers & are
http://www.chacha.com/question/what-is-a-bird-a-re...
Mammals are synapsids[0] a clade that branched off early (AFAIK during the carbonian) In current taxonomy, they are not considered reptiles (the latter being anapsids (i.e. turtles
http://www.quora.com/How-are-mammals-reptiles-and-...
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...
Explore this Topic
Birds are not mammals or reptiles. They have their own classification as a bird. Many people think they are reptiles due to a theory that dinosaurs evolved into ...
Birds are considered reptiles under the phylogenetic classification system. This method of categorizing organisms was developed in the 1940s and is based on common ...
Amniota (or Amniotes) are the vertebrate group that have amniotic eggs. Amniota are reptiles, birds and mammals. Amniotes are of the superclass Tetrapoda. ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com