Sometimes, an animal just needs to power down and wait. Many animals exhibit some form of torpor, including the long-term dormancy of hibernation. This episode, we explore how these species adjust their body functions, we discuss the pros and cons of this surprisingly common biological strategy, and we’ll take a look at what we know about the evolutionary history and fossil record of hibernation. In the news: walrus diets, ancient weapons, grape evolution, and fossil tardigrades. Time markers: I...
Sep 01, 2024•2 hr 23 min•Ep. 294
Eels are long-bodied fish found in a variety of aquatic habitats, famous for their unusual body plans, distinctive life cycles, and occasional anatomical oddities like extra jaws. This episode, we’re joined by special guest Shay Maden to discuss the diversity, evolution, and fossil history of the true eels of the Order Anguilliformes, and we’ll also make mention of other famous “eels” and the repeated evolution of the eel-like body shape. In the news: dog brains, giant beans, marine crocs, and o...
Aug 18, 2024•1 hr 54 min•Ep. 293
Welcome to Spotlight 2024! In this series, we’re sitting down with our fellow paleo-podcasters to discuss Science Communication. This episode, another returning guest: Meredith Johnson, host of Origin Stories, the Leakey Foundation podcast! Find Origin Stories here: https://leakeyfoundation.org/learn/originstories/ 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 top...
Aug 07, 2024•1 hr 13 min•Ep. 284
Some animals are specialists at eating particularly tough foods like shells, seeds, and bones. Adaptations for a durophagous diet come in many forms in almost all major groups of life. This episode, we discuss how so many animals tackle tough foods, what behaviors and anatomy help them to do it, and the importance of durophagy for understanding fossils and the history of Earth ecosystems. In the news: fossil boas, walking fish, cooked birds, and early arthropods. Time markers: Intro & Announ...
Aug 04, 2024•2 hr 12 min•Ep. 292
Boas and pythons include some of the most famous snake species on Earth, renowned for their incredible tropical diversity, their often beautiful scale patterns, and their often impressive size. This episode, we discuss what sets these two lineages apart from other snakes – and each other – and we explore the evolutionary path recorded in their fossil record. In the news: giant early tetrapods, digging dinosaurs, coastal croc-cousins, and striking snakes. Time markers: Intro & Announcements: ...
Jul 21, 2024•2 hr 30 min•Ep. 291
Leaves. They’re everywhere. They’re the main photosynthesizing organs of plants, and they’re the main source of green on our green-and-blue planet. Leaves come in a truly dizzying variety of shapes, sizes, and specialized functions, and their early evolution laid the foundation for terrestrial ecosystems as we know them. This episode, Aly joins us yet again to talk about the anatomy and diversity of leaves and the incredible information we can learn from leaves in the fossil record. In the news:...
Jul 07, 2024•3 hr 5 min•Ep. 290
Welcome to Spotlight 2024! In this series, we’re sitting down with our fellow paleo-podcasters to discuss Science Communication. Joining us for this episode is Travis Holland, host of Fossils and Fiction! Find Travis and Fossils and Fiction in these places: fossilsfiction.co travisholland.com.au https://researchoutput.csu.edu.au/en/persons/tholla05csueduau Connect with Common Descent: https://linktr.ee/common_descent Join us on Patreon to support the podcast and enjoy bonus content: https://www....
Jul 03, 2024•1 hr 3 min•Ep. 280
Happy Croc Month! Alligators and caimans are the living members of the family Alligatoridae. In this episode, we explore how the gator lineage differs from other crocs, and we’ll dive into the fossil record of the extended gator family tree, a history that includes a diversity of species and some of the largest crocodilians to ever live. In the news: Australian pterosaurs, mega-geese, Neanderthal art, and social ants. Time markers: Intro & Announcements: 00:00:00 News: 00:06:45 Main discussi...
Jun 23, 2024•2 hr 28 min•Ep. 289
Terrestrial animals get around using a variety of gaits: walking, running, galloping, etc. Some of these gaits are particularly bouncy! Hopping comes in many forms in many different groups of animals. This episode, we’ll discuss what makes a particular gait “hoppy,” what functions hopping serves, and what adaptations are found in the best hoppers. Then, we’ll explore what we can tell about hopping in the fossil record. In the news: dinosaur skin, marine worms, ancient monotremes, and plant-ant r...
Jun 09, 2024•2 hr 3 min•Ep. 287
Welcome to Spotlight 2024! In this series, we’re sitting down with our fellow paleo-podcasters to discuss Science Communication. Returning to the podcast for this episode are Sabrina and Garret, hosts of I Know Dino! Find I Know Dino at these places: https://iknowdino.com https://www.patreon.com/join/iknowdino https://pod.link/960976813 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/commonde...
Jun 05, 2024•1 hr 12 min•Ep. 274
Tongues are a common feature among tetrapod animals, but the evolution of this organ is complex and fascinating. Through time, tongues have evolved a wide variety of functions from feeding to sensing to speech. This episode, we’ll explore the diversity of tongues and their bony counterparts in the hyoid apparatus, we’ll examine what’s known about tongue evolution, and we’ll discuss how fossils – especially hyoids – help us interpret the tongues of extinct species. In the news: dinosaur temperatu...
May 26, 2024•2 hr 11 min•Ep. 286
Language is possibly the most important and incredible ability that sets humans apart from other species. Whether spoken, written, or signed, language exists in thousands of varieties among modern human cultures, and there are some very language-like communication systems in other animals, too. This episode, we discuss what defines language, what makes it so special, and what we understand about its history and origins among our ancestors. In the news: orangutan medicine, frog skin, giant sharks...
May 12, 2024•2 hr 5 min•Ep. 285
Welcome to Spotlight 2024! In this series, we’re sitting down with our fellow paleo-podcasters to discuss Science Communication. This episode, we’re joined by Dylan Wilmeth, host of Bedrock: Earth’s Earliest History! Find Dylan’s podcast here: https://www.bedrockpodcast.com/ 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 ep...
May 01, 2024•1 hr 9 min•Ep. 273
Cicadas are among the most famous insects in the world, and in summer 2024, they’re set to put on quite a show in North America! This episode, we explore the function and evolution of cicadas’ most famous features, including their notoriously loud calls and their incredible life cycles, and we’ll take a peek into the past at the fossil record of cicadas and their ancient cousins. In the news: giant snakes, big kangaroos, dinosaur amino acids, and echolocation tissues. Time markers: Intro & A...
Apr 28, 2024•2 hr 13 min•Ep. 281
It’s a new series of Silver Screen Science! As usual, we’re discussing how science is portrayed on the big screen, this time with a new theme: Sharks! It’s a series about shark movies, so how could we skip the most famous and influential shark film of all time? – Jaws. 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? Su...
Apr 24, 2024•1 hr 8 min•Ep. 278
It’s a new series of Silver Screen Science! As usual, we’re discussing how science is portrayed on the big screen, this time with a new theme: Sharks! This time, we’re exploring the monster sharks and suspicious science of a 90s shark classic – Deep Blue Sea. 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 ...
Apr 17, 2024•55 min•Ep. 277
This group of predatory dinosaurs includes such famous names as Deinonychus , Microraptor , and Velociraptor , and they’re among the most well-studied and popular dinosaurs of all time. This episode, we’ll discuss what sets these dinosaurs apart, as well the much-discussed and -debated questions surrounding their relationships to birds, their distinctive claws and wings, and their hunting strategies. In the news: ant-mimic spiders, fishapod spinal column, early dinosaur growth, and a fossil tape...
Apr 14, 2024•2 hr 34 min•Ep. 279
It’s a new series of Silver Screen Science! As usual, we’re discussing how science is portrayed on the big screen, this time with a new theme: Sharks! This episode, we’re examining the newest installment in the film series about giant monster ancient sharks – Meg 2: The Trench. 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 ...
Apr 10, 2024•1 hr 1 min•Ep. 276
Welcome to Spotlight 2024! In this series, we’re sitting down with our fellow paleo-podcasters to discuss Science Communication. It’s episode two, and our guests are the hosts of Palaeo After Dark: James, Amanda, and Curtis! Find Palaeo After Dark at their website: www.palaeoafterdark.com 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? ...
Apr 03, 2024•1 hr 4 min•Ep. 271
An animal eating another member of its own species might sound like a rare and abnormal occurrence – and it is often portrayed that way – but cannibalism is actually extremely widespread and common in nature. Some animals are occasional cannibals, while some go so far as to rely on this behavior to fuel proper growth and development. In this episode, we’ll discuss some of the varieties of cannibalism, explore how this behavior has been misunderstood and misconstrued in the past, and investigate ...
Mar 31, 2024•2 hr 21 min•Ep. 275
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, fossi...
Mar 17, 2024•2 hr 7 min•Ep. 272
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 bonu...
Mar 06, 2024•1 hr 11 min•Ep. 270
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...
Mar 03, 2024•2 hr 10 min•Ep. 269
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 Ne...
Feb 18, 2024•2 hr 17 min•Ep. 268
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 hu...
Feb 04, 2024•1 hr 55 min•Ep. 267
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 photosynthesi...
Jan 21, 2024•2 hr 24 min•Ep. 266
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 mar...
Jan 07, 2024•2 hr 22 min•Ep. 265
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://commondescentpodca...
Dec 31, 2023•4 hr 24 min•Ep. 264
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 hi...
Dec 24, 2023•2 hr 9 min•Ep. 263
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, mamma...
Dec 10, 2023•2 hr 12 min•Ep. 262
