Episode 154 - Live Birth

The Common Descent Podcast

Common Descent

Science, Education, Earth Sciences, Natural Sciences, Science:natural Sciences

4.8 • 764 Ratings

🗓️ 11 December 2022

⏱️ 115 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

Viviparity is the reproductive style where embryos develop inside a parent’s body instead of inside an egg the parent lays. It’s a very familiar habit to us placental mammals, but it’s also an extremely widespread and diverse feature of life. Seriously, it’s ridiculous just how many times viviparity has evolved and just how many different ways species have found to be viviparous. In this episode we’ll answer such questions as: How and why does viviparity evolve? What features vary from one viviparous group to the next? And how do we identify viviparous animals in the fossil record? In the news: army ants, oldest lizards, beaver families, and swimming dinosaurs. Time markers:Intro & Announcements: 00:00:00News: 00:04:30Main discussion, Part 1: 00:33:30Main discussion, Part 2: 01:13:30Patron question: 01:46:30 Check out our blog for bonus info and pictures:http://commondescentpodcast.wordpress.com/ The 2022 End of the Year Q&A Form is LIVE! Submit your question now!https://forms.gle/GTgew75GmVxAKejt6 Follow this link for a 30-day free trial to Audible!www.audibletrial.com/CommonDescent Join us on Patreon to support the podcast and enjoy bonus content! https://www.patreon.com/commondescentpodcast Or make a one-time donation via PayPal: https://tinyurl.com/4c68u4hp Find merch at the Common Descent Store! http://zazzle.com/common_descent Join the Common Descent Discord server! https://discord.gg/CwPBxdh9Ev Follow and Support us on:Twitter: https://twitter.com/CommonDescentPCFacebook: https://www.facebook.com/commondescentpodcastInstagram: @commondescentpodcast YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduwPodBean: https://commondescentpodcast.podbean.com/ iTunes: https://itunes.apple.com/us/podcast/the-common-descent-podcast/id1207586509?mt=2 You can email us at commondescentpodcast(at)gmail.comOr send us physical mail at:The Common Descent Podcast1735 W State of Franklin Rd. Ste 5 #165Johnson City, TN 37604 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 3.0http://creativecommons.org/licenses/by/3.0/

Transcript

Click on a timestamp to play from that location

0:00.0	You're listening to the Common Descent Podcast.
0:18.9	Hello, Will.
0:20.0	Hello, David. Hello, world, and welcome to the Common Descent podcast, Will. Hello, David.
0:21.0	Hello, world, and welcome to the Common Descent podcast.
0:24.8	This is episode 154.
0:28.7	On this podcast, we talk about paleontology, evolution, life history, and the like.
0:33.5	This episode's topic is vivaparity.
0:36.6	What's that?
0:37.2	A process known to its friends as live birth.
0:40.2	Yeah.
0:41.2	Giving birth to Live Young.
0:42.7	We did an episode about eggs.
0:44.2	A while ago, episode 92, where we talked about eggs and the creatures that lay them.
0:50.4	This episode, we're talking about the other side of that coin which is not a two-sided coin
0:54.8	live birth giving birth instead of laying eggs giving birth to live young this is a thing
1:01.7	that lots of animals do it is more common than probably more common than you think it is
1:07.6	more common than i thought it was yeah no this gets, this gets portrayed very often as like, and mammals do it, and then that's the end of it.
1:16.0	Everyone else lays eggs.
1:17.3	This is going to be a fun discussion because not only are we going to get to talk about the diversity of live-bearing biology, the history of it, what we know about the evolution of the behavior, what we see in
1:30.3	the fossil record, but also, we're going to get to knock out a couple of probably misconceptions
1:35.5	about this and just sort of where it falls in the animal tree of life.
1:42.2	And I'm always excited when we get to debunk some myths.
	...

Please login to see the full transcript.

Previous episode | Next episode

Disclaimer: The podcast and artwork embedded on this page are from Common Descent, and are the property of its owner and not affiliated with or endorsed by Tapesearch.

Generated transcripts are the property of Common Descent and are distributed freely under the Fair Use doctrine. Transcripts generated by Tapesearch are not guaranteed to be accurate.