The Common Descent Podcast

There’s a pandemic on, and we and many of our listeners are spending lots of time at home. On the bright side, it’s a good opportunity to watch movies and record Silver Screen Science! So, we’re putting together some new episodes, to keep you – and ourselves – entertained. This episode, we revisit the King of Monsters: Godzilla (1998) The Common Descent Store is open! Get merch! http://zazzle.com/...

Life ain’t always easy. Injury and disease are a persistent threat for life of all sorts, and that’s been true for as long as there has been life. Fortunately for us, these threats can leave evidence in fossils, teaching us about the lives, struggles, and sometimes deaths of ancient organisms. The study of this evidence is called paleopathology, and in this episode, our friend Laura will explain t...

There’s a pandemic on, and we and many of our listeners are spending lots of time at home. On the bright side, it’s a good opportunity to watch movies and record Silver Screen Science! So, we’re putting together some new episodes, to keep you – and ourselves – entertained. This episode, ca-caw ca-caw tookie tookie: Evolution (2001) The Common Descent Store is open! Get merch! http://zazzle.com/com...

  One of the rewards we offer to our highest-level Patrons is a special mini-episode on an animal or group of their choosing. We’ve done five so far, and we’ve put them together into this compilation so you can all now enjoy them! Special thanks to our Patrons for their generous contributions, and thanks also to our special guests, Keila and the cat. 00:04:15 Desmatosuchus for Julie 00:26:00 Stygi...

There’s a pandemic on, and we and many of our listeners are spending lots of time at home. On the bright side, it’s a good opportunity to watch movies and record Silver Screen Science! So, we’re putting together some new episodes, to keep you – and ourselves – entertained. This episode, happy 30-year anniversary to: Tremors (1990) Check out our blog for bonus info and pictures: http://commondescen...

In 1938, a fishing crew pulled up a fish that everyone thought had been extinct for 70 million years. Since then, coelacanths have become famous not just for their strangely incomplete fossil record, but also for their unique anatomy, their reclusive lifestyle, and their close relationship to land vertebrates. From fossils to genetics, this episode is all about what we know – and what we’re missin...

Few fossil animals are as popular with the public, as abundant in the fossil record, or as important to the study of past life on Earth as trilobites. These ocean-dwelling arthropods came in an amazing variety of shapes, sizes, and lifestyles, with many thousands of identified species, and they persisted on our planet for more than 270 million years. And best of all, they left behind an incredible...

Metamorphosis is the process that turns a caterpillar to a butterfly, a fry to a fish, and a tadpole to a frog. Animals have been metamorphosing for over 500 million years, from early crustaceans to the many fish, amphibians, and arthropods that do it today. Larvae, pupae, and adults are known in the fossil record, but the evolutionary history of this incredible life strategy is still mysterious....

Happy Darwin Day! This time around, we’re talking about Mary Anning! She was one of the earliest modern paleontologists, she helped lay the groundwork for our modern methods of uncovering and understanding fossils, and she was famously underappreciated in her time. We’re joined in our discussion by our friend Brittney Stoneburg from the Western Science Center! Follow Brittney on Twitter and Instag...

The first pterosaur to be scientifically identified was Pterodactylus, more than 200 years ago. Since then, scientists have grappled with understanding these bizarre and fantastic animals, aided by inspired science and incredible discoveries. In this episode, we’ll discuss what we know – and what we don’t know – about how these animals evolved, survived, and ruled the skies in the Age of Reptiles....

At DragonCon 2019, Will and David were part of the Paleontology Hour Panel, where a room full of nerds asked all their paleo-related questions to a panel of experts - and we recorded it! We were joined on the panel by: Trevor Valle @tattoosandbones Charon Henning @TheOddAngel   Check out our blog for bonus info and pictures: http://commondescentpodcast.wordpress.com/ The Common Descent Store is op...

Hand a kitchen appliance to a child and they’re likely to find a whole new way to use it. This happens in evolution, too – traits adapted for one purpose turn out to be beneficial for a whole other reason, and so the trajectory of natural selection changes. The term for this is exaptation, but it’s a complicated concept, and not everyone even likes using the word. Let’s discuss what this word mean...

Happy New Year! We got a ton of questions this year, so enjoy the end of the decade with this extra-long edition of David and Will saying the things you want to hear! See you in the ‘20s! Check out our blog for bonus info and pictures: http://commondescentpodcast.wordpress.com/ The Common Descent Store is open! Get merch! http://zazzle.com/common_descent Follow and Support us on: Patreon: https://...

Happy New Year! As we transition into a new decade, this episode is about one of the most important and incredible transitions in the evolutionary history of life. In the Late Devonian, one particular group of bony fish spent many millions of years experimenting with new forms of fins, skulls, and lifestyles, ultimately giving rise to the first land-dwelling vertebrates and setting the stage for 3...

The evolution of horses is a classic story, first because it is a beautiful example of evolution in the fossil record, and second because of how our scientific perspective of this story has shifted over the years. From the tiny forest-dwellers of the Eocene, barely recognizable as horse-relatives, to the mighty domesticated animals we know today, we’ll unpack what we know – and what we thought we...

Welcome to the world of Pokémon Paleontology! In this digression – by popular demand – we explore how the fictional world of Pokémon draws inspiration from real world science, particularly in regard to fossils and evolution. We’ll name our favorite fossil Pokémon, discuss Pokémon evolution, and point out where the Poké-science gets wonky. What’s your favorite bit of Pokémon science? We're doing an...

Time for another extinction! This time, we’re discussing what might be the most ancient, most mysterious, and most catastrophic mass extinction event of all time. The Great Oxidation Event marks the turning point that set our atmosphere on course to its current oxygen-rich state and made the Earth hospitable for life as we know it … at the expense of all the life that came before. In the news: the...

South America today is home to some of the most incredible ecosystems on the planet, and its fossil record is even more varied and fantastic. In this episode, we explore the history of the continent from its early formation to its long Cenozoic isolation, and we’ll highlight some of the strangest ancient creatures – especially its bizarre mammals – that have called South America home. In the news:...

Aly's back for more plants! As our friend Aly is fond of pointing out, plants aren't just the colorful background of Earth history, they're dynamic and influential drivers of environmental change. And few plant innovations are more famous or important than the familiar form of a tree. For hundreds of millions of years, trees have formed the basis of many of our planet's most widespread and diverse...

Welcome ... to Spookulative Evolution. It’s October, and we’re back with more Spook-E! Each week this month, we’re choosing a creepy creature and discussing how it – or something like – might evolve biologically, pulling inspiration from critters of the real world. This month’s theme: monsters of Greek mythology. In this final episode of this season, we take on the task of evolving the most famous...

The oceans of the Mesozoic were home to a lot of fascinating sea predators, but perhaps none weirder than the plesiosaurs. Four giant flippers, tiny tails, and heads that ranged from enormous death traps to tiny noggins atop ridiculously long necks; there’s truly nothing like them in the world today, which makes them quite the prehistoric puzzle. In this episode, we’ll discuss what we know about t...

Welcome ... to Spookulative Evolution. It’s October, and we’re back with more Spook-E! Each week this month, we’re choosing a creepy creature and discussing how it – or something like – might evolve biologically, pulling inspiration from critters of the real world. This month’s theme: monsters of Greek mythology. This episode, we tackle the great monster of Lerna. How can we use nature's toolkit t...

Welcome ... to Spookulative Evolution. It’s October, and we’re back with more Spook-E! Each week this month, we’re choosing a creepy creature and discussing how it – or something like – might evolve biologically, pulling inspiration from critters of the real world. This month’s theme: monsters of Greek mythology. This episode, we're talking about Medusa and her kin. How could natural selection pro...

During the Cretaceous Period, North America flooded. The entire middle section of the continent was submerged, creating an inland sea that stretched from the Arctic to the Gulf of Mexico and hosted a unique and fascinating underwater ecosystem. Not only that, but it split west from east, creating two distinct "subcontinents." In this episode, we explore how this sea came to be, what lived within i...

Welcome ... to Spookulative Evolution. It’s October, and we’re back with more Spook-E! Each week this month, we’re choosing a creepy creature and discussing how it – or something like – might evolve biologically, pulling inspiration from critters of the real world. This month’s theme: monsters of Greek mythology. This episode, we turn to the multitude of stories about winged bird-like humanoids. H...