# Which animals do not have external bilateral symmetry?

**URL:** <https://boards.straightdope.com/t/which-animals-do-not-have-external-bilateral-symmetry/922259>\
**Category:** Cecil's Columns/Staff Reports\
**Created:** [October 5, 2020, 12:34pm UTC](https://boards.straightdope.com/t/which-animals-do-not-have-external-bilateral-symmetry/922259 "2020-10-05T12:34:15Z")\
**Posts on this page:** 1\
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**Author:** ![Jackknifed\_Juggernaut](https://avatars.discourse-cdn.com/v4/letter/j/9de053/32.png) [@Jackknifed\_Juggernaut](https://boards.straightdope.com/u/Jackknifed_Juggernaut)\
**Post date:** [October 5, 2020, 12:34pm UTC](https://boards.straightdope.com/t/which-animals-do-not-have-external-bilateral-symmetry/922259/1 "2020-10-05T12:34:15Z")

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In the column about why internal organs are not symmetric within the body, Cecil mentions that 99% of animal species are externally symmetric. Which ones are not?

> **[Why aren’t internal organs symmetrical?](https://www.straightdope.com/21344489/why-aren-t-internal-organs-symmetrical)**

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