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The Common Descent Podcast

Common Descent

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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 sub ...
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Today, bony animals are some of the most diverse organisms on Earth, but it wasn’t always that way. This episode, we explore what features distinguish vertebrates from their closest relatives, and we dive into the abundant evidence from genetics, embryology, and the fossil record that gives us a glimpse at how our distant ancestors came to be. In t…
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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 …
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The dome-headed dinosaurs are some of the most iconic ancient reptiles, but they’re surprisingly unexplored compared to other dinos. This episode, we explore what makes these dinosaurs unique, what limits our understanding of them, and the many confounding mysteries that paleontologists have been scratching their heads over, including the question …
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In this special guest episode of Silver Screen Science, we're joined by Sabrina and Garret of I Know Dino to discuss the science and scientists of the newest installment in the Jurassic franchise: Jurassic World: Rebirth! Find more Common Descent: http://commondescentpodcast.com/ Join Common Descent and I Know Dino on Patreon to support the podcast…
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Welcome … to Cute-E! During our Spook-E series, we speculate on the evolution of monsters from myth and popular media, but we leave out fiction’s more adorable creatures. In Cute-E, we choose cuddlier critters and discuss how they – or something like them – could evolve here on Earth, pulling inspiration from real-world species across our planet’s …
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Generally speaking, it’s not a good idea to mess with ants. But several lineages of animals have evolved to be ant-eating specialists. This episode, we discuss anteaters, the suite of adaptations that allow them to focus on ant-eating, and the variety of other species that have evolved similar adaptations for the same purpose. We explore the evolut…
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Welcome ... to Spookulative Evolution. Spook-E Season is back! All throughout October, we pick monsters from myth and media and speculate how they – or something like them – could evolve here on Earth, pulling inspiration from real-world species across our planet’s history. This year’s theme is Monsters of Nintendo! This episode, we take the hunt a…
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Welcome ... to Spookulative Evolution. Spook-E Season is back! All throughout October, we pick monsters from myth and media and speculate how they – or something like them – could evolve here on Earth, pulling inspiration from real-world species across our planet’s history. This year’s theme is Monsters of Nintendo! This time, we’re sailing with th…
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Located in southeastern Alberta is a stretch of gorgeous badlands that are home to some of the world’s absolute best Late Cretaceous fossils. This episode, we explore how Dinosaur Provincial Park earned its designation as a UNESCO World Heritage Site, we list off some of the famous dinosaurs who once lived there, and we discuss a fraction of the ma…
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Welcome ... to Spookulative Evolution. Spook-E Season is back! All throughout October, we pick monsters from myth and media and speculate how they – or something like them – could evolve here on Earth, pulling inspiration from real-world species across our planet’s history. This year’s theme is Monsters of Nintendo! This episode, we take a trip to …
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Welcome ... to Spookulative Evolution. Spook-E Season is back! All throughout October, we pick monsters from myth and media and speculate how they – or something like them – could evolve here on Earth, pulling inspiration from real-world species across our planet’s history. This year’s theme is Monsters of Nintendo! This episode, we begin with a ba…
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The faces of vertebrate animals are often soft and full of teeth, but there is a common alternative. Birds, turtles, and many more groups have developed toothless snouts covered in a tough sheath. This episode, we’ll explore the defining features of beaks and their various functions. And we’ll take a tour through animal life past and present to inv…
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Dodos are probably the single most famous case of recent human-induced extinction. First documented in the late 1500s and extinct within a century, dodos have become a global reminder of the devastating potential of human activity. This episode, we review the brief history of human interactions with dodos, and we explore what recent research and fo…
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Forests are among the most widespread and diverse biomes on our planet. This episode, we’re joined by our favorite paleobotanist, Dr. Aly Baumgartner, to explore what defines a forest, how these habitats function, and how they differ around the globe. Then, we’ll take a trip into the past to discuss how paleontologists study ancient forests and how…
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Most vertebrate animals on land get around on all fours, but some of us have committed to two-legged locomotion. This episode, we explore the various ways animals have evolved bipedalism and the many benefits that come with it. We’ll also take a look at how we identify bipedal animals in the fossil record, and we’ll zoom in on the evolutionary stor…
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Mutation. It is the key to our evolution. As our cells constantly divide and reproduce and replicate our DNA, errors and inconsistencies develop, leading to the incredible variation of life that drives evolutionary change. This episode, we explore the genetic mechanisms behind mutation and we discuss how scientists study mutations to understand the…
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On the outside, shrews might seem like standard tiny mammals, but their anatomy and lifestyle are highly specialized. This episode, with help from special guest Derek den Ouden, we explore the diverse habits of shrews, the anatomical features that set them apart, and how they thrive worldwide despite being perpetually on the brink of starvation. Th…
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Lizards are extremely good at becoming snake-shaped. A long body with small or absent limbs is a shape that has evolved dozens of times across nearly every major lineage of lizards. This episode, we explore the diversity of leglessness in lizards, we discuss which groups have done it and which groups have done it best, and we examine what’s known a…
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Today’s crocs are iconic semi-aquatic predators, but their extended family tree features lots of land-dwelling cousins. This episode, we take a tour through croc evolutionary history and explore the many times these reptiles have taken to life on dry land. We’ll examine what features these terrestrial crocs shared, which ones they didn’t, and what …
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For over 100 million years, North America and Asia have been connected over the Pacific Ocean through a region called Beringia. The comings and going of plants and animals across this connection have shaped ecosystems of the past and present. This episode, we explore the geologic history of the region and which ancient species have managed to live …
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Take a deep breath and appreciate for a moment the organs that let you do it so efficiently. Lungs are an invaluable tool for life out of the water, and are therefore a favorite topic for paleontologists interested in early animals on land. This episode, we explore the diversity of modern lungs and the few but fascinating insights we have into the …
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Bears are among the most charismatic and impressive mammals. They have large bodies, very flexible lifestyles, and an extensive fossil record that includes some of the best-preserved and largest fossil mammals of all time. This episode, we explore what makes bears so distinctive and successful, and how their diversity has changed over time. In the …
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Just about every body of water on Earth, from oceans to puddles, is home to an ecosystem of tiny drifting organisms. This episode, we discuss what sorts of organisms we might expect to find in a swarm of plankton, we’ll explore how plankton is so fundamental to biological and geological systems on Earth, and we’ll take some time to lay out some of …
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Silver Screen Science is our series where we explore how science is portrayed on the big screen. This year, we’re focused on one recurring franchise: Planet of the Apes! Finally, we visit the ongoing prequel franchise with the story of how it all got started: Rise of the Planet of the Apes. Check out our website for blog posts and more: http://comm…
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With several thousand living species, ferns are the second most diverse vascular plants around today, after angiosperms. Ferns are also abundant and well-known in the fossil record. This episode, Aly joins us to explore the dizzying variety of ferns and their ferny-friends, past and present. In the news: When the Earth Was Green, weird wasps, and a…
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