Are Birds Mammals Or Reptiles?

Are birds mammals or reptiles? Find out in this video that presents fossil evidence to answer this disputed question. Images used in the video: https://commons.wikimedia.org/wiki/File:Archaeopteryx_lithographica.jpg. von Meyer, Public domain, via Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Dinosauria_-_Archaeopteryx_01.jpg. Tylwyth Eldar, CC BY-SA 4.0 <;https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons https://commons.wikimedia.org/wiki/File:202010_Archaeopteryx_lithographica.png. DataBase Center for Life Science (DBCLS), CC BY 4.0 <;https://creativecommons.org/licenses/by/4.0>, via Wikimedia Commons