# What defines a reptile?

**URL:** <https://boards.straightdope.com/t/what-defines-a-reptile/163285>\
**Category:** Factual Questions\
**Created:** [March 22, 2003, 3:54am UTC](https://boards.straightdope.com/t/what-defines-a-reptile/163285 "2003-03-22T03:54:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Markxxx](https://avatars.discourse-cdn.com/v4/letter/m/5daacb/32.png) [@Markxxx](https://boards.straightdope.com/u/Markxxx)\
**Post date:** [March 22, 2003, 3:54am UTC](https://boards.straightdope.com/t/what-defines-a-reptile/163285/1 "2003-03-22T03:54:18Z")

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If it has feathers it is a bird. If it has hair it is a mammal. What defines a reptile. I hear TV shows saying Alligators are more similar to birds then turtles. Right?