The Common Descent Podcast

Episode 133 - Symbiosis

February 19, 2022

None of us are alone. Like, in the literal, biological sense. Symbiotic relationships – close interactions between unrelated organisms – are a defining feature of life on Earth. Each of our bodies has its own share of parasites, hitchhikers, and tiny helpers, and some of the most prominent ecosystems on Earth function only by virtue of the symbiotic relationships at their foundations. In this episode, we touch on the incredible diversity and impact of symbiosis, and how the deep history of these relationships has created the world we know today.

In the news: sick sauropods, puking pterosaurs, jumping genes in snakes, and dino-eating crocs.

Time markers:
Intro & Announcements: 00:00:00
News: 00:05:00
Main discussion, Part 1: 00:39:30
Main discussion, Part 2: 01:24:30
Patron question: 02:05:30

Check out our blog for bonus info and pictures:

Join us on Patreon to support the podcast and enjoy bonus content! 

Or make a one-time donation via PayPal:

Find merch at the Common Descent Store!

Join the Common Descent Discord server!

Follow and Support us on:
Instagram: @commondescentpodcast

You can email us at commondescentpodcast(at)
Or send us physical mail at:
The Common Descent Podcast
1735 W State of Franklin Rd. Ste 5 #165
Johnson City, TN 37604

The Intro and Outro music is “On the Origin of Species” by Protodome.
More music like this at

Musical Interludes are "Professor Umlaut" by Kevin MacLeod ( Licensed under Creative Commons: By Attribution 3.0

Podbean App

Play this podcast on Podbean App