E346 - Episode 231 - Back to the Water (Secondarily Aquatic Vertebrates)

Nearly 400 million years ago, an unusual group of fish gave rise to the first land-dwelling vertebrates. Since then, their descendants have repeatedly moved back into the water. This episode, we explore the many ways these species adapt to the challenges of turning a terrestrial body into one that can survive at sea, and we investigate some of the most famous and confusing cases from the fossil record.

In the news: post-extinction oceans, croc eggs, damaged dino tails, and meat-eating dung beetles.

Time markers:
Intro & Announcements: 00:00:00
News: 00:05:45 
Main discussion, Part 1: 00:40:15
Main discussion, P...