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Episodes
Join David and Will as they explore the paleontologists’ perspective on various topics in life and earth history. Each episode features a main discussion on a topic requested by the listeners, presented as a lighthearted and educational conversation about fossils, evolution, deep time, and more. Before the main discussion, each episode also includes a news segment, covering recent research related to paleontology and evolution. Each episode ends with the answer to a question submitted by subscribers on Patreon. New episodes with new topics every fortnight!
Episodes

Saturday Mar 16, 2024
Episode 187 - Migration
Saturday Mar 16, 2024
Saturday Mar 16, 2024
Among the most spectacular of animal behaviors is migration, the habit of many species to undertake massive journeys, sometimes traveling thousands of kilometers to access food or breeding grounds. This episode, we explore the incredible diversity of migratory behaviors, we examine the functions and adaptations that make migration happen, we discuss how migration is defined, and we investigate some of the tools we can use to identify migration in the distant past.
In the news: giant crabs, fossil forests, early cephalopods, and mating termites.
Time markers:
Intro & Announcements: 00:00:00
News: 00:04:40
Main discussion, Part 1: 00:30:15
Main discussion, Part 2: 01:26:00
Patron question: 01:49:35
Check out our website for this episode’s blog post and more: http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here: https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/

Wednesday Mar 06, 2024
Spotlight 2024 - Adele Pentland, Pals in Palaeo
Wednesday Mar 06, 2024
Wednesday Mar 06, 2024
Welcome to Spotlight 2024! In this series, we’re sitting down with our fellow paleo-podcasters to discuss Science Communication.
In this first episode, our guest is Adele Pentland, host of Pals in Palaeo!
Find Adele and Pals in Palaeo in these places:
https://adelepentland.com/
https://palsinpalaeo.com/
https://www.instagram.com/palsinpalaeo/
https://www.instagram.com/palaeodel/
Connect with Common Descent: https://linktr.ee/common_descent
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here: https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org.

Saturday Mar 02, 2024
Episode 186 - Owls
Saturday Mar 02, 2024
Saturday Mar 02, 2024
Owls are among the world’s most iconic and charismatic birds, and they’re also among the most effective aerial predators. This episode, we’ll take a tour of the amazing adaptations that have allowed owls to achieve their modern diversity and worldwide range, and we’ll explore what we know – and what we don’t – about their evolutionary history.
In the news: snake evolution, ancient polar life, dinosaur joints, and dragon teeth.
Time markers:
Intro & Announcements: 00:00:00
News: 00:05:10
Main discussion, Part 1: 00:40:35
Main discussion, Part 2: 01:23:50
Patron question: 02:03:15
Check out our website for this episode’s blog post and more: http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here: https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/

Saturday Feb 17, 2024
Episode 185 - Cacti
Saturday Feb 17, 2024
Saturday Feb 17, 2024
Cacti are famous for their spine-shaped leaves, their water-retaining tissues, their green stems, and especially for being among the most well-adapted organisms on Earth for dry environments. This episode, we’re joined by Dr. Aly Baumgartner to discuss the diversity of cacti, their unique adaptations for an unusual lifestyle, and their mysterious evolutionary past.
In the news: Stone Age jewelry, kelp fossils, long-jawed fish, and early trees.
Time markers:
Intro & Announcements: 00:00:00
News: 00:06:00
Main discussion, Part 1: 00:38:25
Main discussion, Part 2: 01:25:00
Patron question: 02:04:00
Check out our website for this episode’s blog post and more: http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here: https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/

Saturday Feb 03, 2024
Episode 184 - Richard Owen
Saturday Feb 03, 2024
Saturday Feb 03, 2024
A familiar name to modern biologists and paleontologists, Sir Richard Owen is famous for his pioneering work in the fields of paleontology and comparative anatomy, his contributions to public appreciation of biological sciences, and his often antagonistic relationships with contemporary scientists. This episode, we’ll explore Owen’s major scientific contributions and his long-standing reputation as a villain of 19th Century science.
In the news: temnospondyl survivors, big sauropods, dinosaur hunting, and mammoth journeys.
Time markers:
Intro & Announcements: 00:00:00
News: 00:04:50
Main discussion, Part 1: 00:32:10
Main discussion, Part 2: 01:04:30
Patron question: 01:36:35
Check out our website for this episode’s blog post and more: http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here: https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/

Saturday Jan 20, 2024
Episode 183 - Feathers
Saturday Jan 20, 2024
Saturday Jan 20, 2024
Feathers are among the most diverse and complex forms of animal integument. Today, they’re exclusive to birds, where they can be found in a dizzying variety of forms and functions, and incredible fossils reveal even more diversity of feathers on ancient dinosaurs. This episode, we explore the features of modern feathers, the mysteries of feather origins, and the much-discussed question of which ancient animals were truly feathered.
In the news: sturdy bird necks, giant worms, early photosynthesis, and very old skin.
Time markers:
Intro & Announcements: 00:00:00
News: 00:06:20
Main discussion, Part 1: 00:37:00
Main discussion, Part 2: 01:15:55
Patron question: 02:11:30
Check out our website for this episode’s blog post and more: http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here: https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/

Saturday Jan 06, 2024
Episode 182 - Camouflage
Saturday Jan 06, 2024
Saturday Jan 06, 2024
Blending in with the surroundings is an incredibly useful habit. Even without evidence, this fact would be obvious from the sheer variety of organisms that do it and the vast diversity of strategies and adaptations they use. This episode, we look at what camouflage is and how it works in its many forms, and we explore how we can spot camouflage – and what we can learn from it – in the fossil record.
In the news: curled-up trilobites, Antarctic octopus DNA, crab organs, and giant whales.
Time markers:
Intro & Announcements: 00:00:00
News: 00:05:35
Main discussion, Part 1: 00:37:25
Main discussion, Part 2: 01:29:35
Patron question: 02:14:40
Check out our website for this episode’s blog post and more:
http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here:
https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome.
More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/

Sunday Dec 31, 2023
End of the Year Q&A 2023
Sunday Dec 31, 2023
Sunday Dec 31, 2023
Happy New Year!
It’s time again for our annual answering-your-questions marathon episode! Thanks to all our askers for a great set of questions!
And as always, a huge thanks to all of you who have supported the podcast this year, whether you’re a top-tier Patron or a newcomer who’s just a couple episodes in. You make Common Descent possible.
Now sit back and enjoy several hours of us rambling about whatever you asked about.
Check out our website for blog posts and more:
http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here:
https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome.
More music like this at http://ocremix.org.

Saturday Dec 23, 2023
Episode 181 - Dragonflies
Saturday Dec 23, 2023
Saturday Dec 23, 2023
Dragonflies and damselflies are incredible insects. They are arguably the world’s most skilled fliers, arguably the world’s most successful predators, and arguably the best insects (so says David). Not only that, they and their ancient cousins have been abundant and successful aerial predators for over 300 million years. This episode, we discuss what sets these bugs apart from all the rest, we explore what’s known of their evolution from their surprisingly good fossil record, and of course we highlight their most famous extinct cousins: the giant griffenflies.
In the news: croc habitats, tyrannosaur food, elephant trunks, and early mosquitos.
Time markers:
Intro & Announcements: 00:00:00
News: 00:04:30
Main discussion, Part 1: 00:34:15
Main discussion, Part 2: 01:13:15
Patron question: 01:53:45
Check out our website for this episode’s blog post and more:
http://commondescentpodcast.com/
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here:
https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome.
More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/

Saturday Dec 09, 2023
Episode 180 - Filter Feeding
Saturday Dec 09, 2023
Saturday Dec 09, 2023
Filter feeding is among the most widespread dietary strategies in the world. From tiny bivalves to massive basking sharks, animals have developed a vast array of convergent strategies for filtering tiny food particles out of the water. This episode, we discuss what it takes to be a filter feeder, why it’s so common, the various methods animals employ to make it happen, and how we try (sometimes successfully) to identify filter feeding in the fossil record.
In the news: Thailand trilobites, mammal aging, bird-like footprints, and whale echolocation.
Time markers:
Intro & Announcements: 00:00:00
News: 00:04:55
Main discussion, Part 1: 00:38:30
Main discussion, Part 2: 01:22:00
Patron question: 02:04:30
Check out our website for this episode’s blog post and more:
http://commondescentpodcast.com/
The End of the Year Q&A submission form is open! Submit your question here:
https://forms.gle/EeAMhEfnatVWqmnS9
Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast
Got a topic you want to hear about? Submit your episode request here:
https://commondescentpodcast.com/request-a-topic/
We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent
Lots more ways to connect with us: https://linktr.ee/common_descent
The Intro and Outro music is “On the Origin of Species” by Protodome.
More music like this at http://ocremix.org.
Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/