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ZSL Wild Science Podcast

ZSL Wild Science Podcast

Zoological Society of London

Delve into topical issues in zoology, conservation and the environment, from saving species and protecting the planet, to finding out about the animals living across the globe, including in London's own river Thames. Learn more about the science behind the conservation work being done by ZSL and others, in this podcast from ZSL's Institute of Zoology. Hosted previously by Dr Monni Böhm and Ellie Darbey, and now by Harriet McAra.

53 - ZSL #053 A Tiny Frog Facing an Urgent Crisis
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  • 53 - ZSL #053 A Tiny Frog Facing an Urgent Crisis

    Deep in the dense rainforests of southern Chile lives a tiny amphibian. Just 3cm long, expertly blending into the browns and green of the forest floor, with a narrow-pointed nose and angular body, the Darwin's frog is fighting for survival.

    Scientists at ZSL have spent more than 20 years working on a disease known as chytridiomycosis, which has devastated amphibian populations globally, to try and understand underlying drivers of the distribution, spread and impacts of the disease. In this episode, we hear about the work being done to protect and restore Darwin's frog populations, and how funding from the Postcode Lottery enables this vital research.

    Overview

    00:12 Harriet McAra, Host of Wild Science, Episode introduction 01:21 Dr Andrés Valenzuela-Sánchez, Research Fellow in Wildlife Health at ZSL 28:48 Will Humpington, Climate Change and Environment Advisor at the Postcode Lottery 33:35 Thank you and outro

    Resources

    If there's a topic you'd like to hear on a future podcast, or if you'd like to share your thoughts, email the ZSL Wild Science Podcast at: wild.science@zsl.org Check out our science and conservation work at: www.zsl.org/Science or www.zsl.org/conservation Find out more about the Postcode Lottery's work supporting charitable causes: https://www.postcodelottery.co.uk/charities More about ZSL's relationship with the Postcode Lottery: https://www.zsl.org/support-us/charitable-trusts-and-foundations Find more information on amphibian chytridiomycosis: https://www.zsl.org/what-we-do/projects/amphibian-chytridiomycosis Darwin's frog vocal sac brooding behaviour: https://www.instagram.com/reel/DZQGJR6FGgh/ The first time that chytridiomycosis is documented in a terrestrial species, having previously thought to be only transmissible through water: Valenzuela-Sánchez, A., Delgado-Oyarzún, S., Azat, C. et al. Localized transmission of an aquatic pathogen drives hidden epidemics and population collapse in a terrestrial host. Nat Ecol Evol 10, 308–317 (2026). https://doi.org/10.1038/s41559-025-02930-1 Watch A Leap of Hope, a ZSL film capturing the rescue mission and 7000-mile expedition made by conservationists to protect the Darwin's frog: https://www.youtube.com/watch?v=fs1SIs0KRlk Ranita de Darwin and their work in Parque Tantauco: https://www.ranitadedarwin.org/en/rescatetantauco

    Get in touch

    Email wild.science@zsl.org with your questions, comments, and thoughts for future episodes! Find us @ZSLScience on X or @zslofficial.bsky.social on BlueSky and use the hashtag #ZSLWildScience Follow us on Facebook @ZSLScienceAndConservation
    Fri, 21 Aug 2026 - 34min
  • 52 - ZSL #052 World Swallowtail Day 2026: Celebrating and Saving Iconic Butterflies

    Happy World Swallowtail Day to our listeners! 🦋

    To mark this special day and celebrate these incredible insects, we catch up with Sophie Ledger, Red List Research Associate and Manager at ZSL's Institute of Zoology, and Dr Mark Collins, President of the Swallowtail and Birdwing Butterfly Trust, to explore the ecology, adaptations and challenges of this remarkable family of butterflies, and hear about the work being done to protect and conserve them. Whether you're a lifelong lepidopterist, or simply enjoy watching a butterfly in flight, we hope you enjoy this episode.

    Overview

    00:11 Harriet McAra, Host of Wild Science, Episode introduction 01:19 Sophie Ledger, Red List Research Associate and Manager at ZSL's Institute of Zoology gives an overview of the swallowtail butterfly family, the threats they currently face, and the wonderful (and sometimes weird) adaptations they have evolved to increase their chances of survival 13:29 Sophie and Harriet discuss the work of the IUCN Butterfly and Moth Specialist Group and what comes next for swallowtail populations 22:44 Dr Mark Collins, President of the Swallowtail and Butterfly Birdwing Trust, discusses the work of the Trust both further afield in Malaysia and Bhutan, and closer to home in Norfolk, UK 38:05 Thank you and outro

    Resources

    If there's a topic you'd like to hear on a future podcast, or if you'd like to share your thoughts, email the ZSL Wild Science Podcast at: wild.science@zsl.org Check out our science and conservation work at: www.zsl.org/Science or www.zsl.org/conservation Sophie Ledger: https://www.zsl.org/about-zsl/our-people/sophie-ledger Collins, N. M., & Morris, M. G. (1985). Threatened swallowtail butterflies of the world: the IUCN Red Data Book. IUCN. Available for download from: https://portals.iucn.org/library/node/6844 IUCN SSC Butterfly and Moth Specialist Group: https://iucn.org/our-union/commissions/group/iucn-ssc-butterfly-and-moth-specialist-group IUCN Red List of Threatened Species assessment overview https://www.iucnredlist.org/assessment/process Genital photoreceptors have crucial role in oviposition for females and copulation for males (sees with its genitals). References: Kentaro Arikawa, Hindsight of Butterflies: The Papilio butterfly has light sensitivity in the genitalia, which appears to be crucial for reproductive behavior, BioScience, Volume 51, Issue 3, March 2001, Pages 219–225, https://doi.org/10.1641/0006-3568(2001)051[0219:HOB]2.0.CO;2 Kentaro Arikawa, Nobuhiro Takagi "Genital Photoreceptors Have Crucial Role in Oviposition in Japanese Yellow Swallowtail Butterfly, Papilio xuthus," Zoological Science, 18(2), 175-179, (1 March 2001) Swallowtail and Birdwing Butterfly Trust: https://www.sbbt.org.uk/ Saving Swallowtails Conference: https://youtube.com/playlist?list=PLbsU_zSUBrn7qcbUIxv1vONuqzcOhnHO-&si=mBA8eg-8cwmSu1pS

    Get in touch

    Email wild.science@zsl.org with your questions, comments, and thoughts for future episodes! Find us @ZSLScience on X or @zslofficial.bsky.social on BlueSky and use the hashtag #ZSLWildScience Follow us on Facebook @ZSLScienceAndConservation
    Sun, 14 Jun 2026 - 39min
  • 51 - ZSL #051 From Habitat to Husbandry: Evidence-based animal care

    Modern zoos play a critical role in global conservation, but supporting wildlife under human care goes far beyond habitat design. Hear how ZSL's experts use science, behavioural insight and veterinary care to help animals thrive and support species on the brink of extinction. From ensuring penguins can express their natural behaviours, to delivering tailored veterinary care to supports lions' long-term health and welfare, this episode of Wild Science shines a light on the dedication and expertise within ZSL's Evidence-based Animal Care Team and beyond.

    Overview

    00:13 Harriet McAra, Host of Wild Science, Episode introduction 01:05 Jim Mackie, Animal Behaviour Management Officer, ZSL A history of animal enrichment in zoos, recorded at London Zoo's Penguin Beach 06:57 How zoo animal welfare can contribute to wild species recovery, recorded in the Blackburn Pavilion 20:16 Training for health checks and veterinary care, recorded in the Land of the Lions 39:22 Thank you and outro

    Resources

    If there's a topic you'd like to hear on a future podcast, or if you'd like to share your thoughts, email the ZSL Wild Science Podcast at: wild.science@zsl.org Check out our science and conservation work at: www.zsl.org/Science or www.zsl.org/conservation Jim Mackie: https://www.zsl.org/about-zsl/our-people/jim-mackie The Science of Saving Species: https://www.zsl.org/news-and-events/events/science-saving-species Lion feeding enrichment example: https://www.youtube.com/watch?v=-Hqrweox2UA&t=290

    Get in touch

    Email wild.science@zsl.org with your questions, comments, and thoughts for future episodes! Find us @ZSLScience on X or @zslofficial.bsky.social on BlueSky and use the hashtag #ZSLWildScience Follow us on Facebook @ZSLScienceAndConservation
    Thu, 30 Apr 2026 - 32min
  • 50 - ZSL #038 Extinct in the wild: the vital role of conservation zoos and aquariums in saving species on the brink of extinction

    The world is facing a crisis of species extinction, however targeted efforts in conservation biology can provide a glimmer of hope. A new study led by ZSL, published recently in Science, is the first to assess animals and plants categorised as 'Extinct in the Wild' by the IUCN's Red List of Threatened Species – until now, a surprisingly overlooked group. In this episode, our host Ellie Darbey, with the help of four fantastic guests, discovers the incredible potential for conservation zoos, aquariums, botanical gardens and seedbanks across the world to save these species from the brink of extinction. What are the problems associated with tiny populations? How is ZSL involved in Extinct in the Wild projects? And why won't anyone just choose their favourite species?!

    Overview

    03:36 - Ellie Darbey introduces the first guest, Dr Donal Smith (Postdoctoral Research Associate) to discuss the new publication and small population biology

    18:50 - Ellie is joined by Dr John Ewen (Senior Research Fellow, Institute of Zoology, ZSL) to talk about ZSL's Extinct in the Wild initiative and conservation decision making

    28:25 - Species Spotlight: Partula snails!

    29:40 - Ellie welcomes Alex Cliffe (Ectotherms Team Leader, ZSL Whipsnade Zoo), to discuss breeding programmes in zoos, and ZSL's work with the Mexican pupfish

    39:45 - Ellie is joined by the final guest, Melanie Mesa Blas (Guam Department of Education and recipient of 2022 National Geographic Explorer Grant with ZSL) to find out about the future of the Sihek, or Guam kingfisher and considerations for releasing back into the wild

    49:28 - The guests give their thoughts on the most important thing needed now to save these species on the brink of extinction

    Resources

    If there's a topic you'd like to hear on a future podcast, or if you'd like to share your thoughts on the one thing these Extinct in the Wild species need to survive, email the ZSL Wild Science Podcast at: wild.science@zsl.org Check out our science and conservation work at: www.zsl.org/Science or www.zsl.org/conservation Previous Episode mentioned #010 on the IUCN Red List: https://www.zsl.org/zsl-wild-science-podcast IUCN Red List: https://www.iucnredlist.org/ The new publication 'Extinct in the wild: The precarious state of Earth's most threatened group of species': https://www.science.org/doi/10.1126/science.add2889 and blog: https://www.zsl.org/news-and-events/news/conservation-zoos-have-powerful-potential-reverse-extinction ZSL's conservation work with partula snails: https://www.zsl.org/what-we-do/projects/partula-snail-conservation ZSL's Sihek or Guam Kingfisher conservation project: https://www.zsl.org/what-we-do/projects/sihek-conservation Previous ZSL Science and Conservation Event: https://www.zsl.org/news-and-events/events/return-wild-how-can-we-recover-extinct-wild-species

    Get in touch

    Email wild.science@zsl.org with your questions, comments, and thoughts for future episodes! Tweet us @ZSLScience with the hashtag #ZSLWildScience Follow us on Facebook @ZSLScienceAndConservation
    Tue, 28 Mar 2023 - 52min
  • 49 - ZSL #050 Mapping Nature's Code

    How does our DNA, the tiny building blocks that make every species, and every individual, totally distinct, impact our evolution? In this episode, we learn how we can visualise our DNA, or genome, to allow us to better organise the tree of life, and how learning more about this genetic make-up can provide insights into how a species survives in the face of a changing environment. We head to Cambridge, to ring native UK birds and collect samples of their DNA, and then to the Wellcome Sanger Institute, to see learn how those samples are processed and sequenced as part of a collaborative project aiming to sequence the genomes of all eukaryotes in Britain and Ireland; the Darwin Tree of Life project.

    Overview

    00:11 Harriet McAra, Host of Wild Science, Episode introduction 01:26 Bird ringing in Cambridgeshire and Dr Ava Jenkins, Wildlife Veterinarian and Postdoctoral Research Associate, ZSL Institute of Zoology 03:13 Professor Mark Blaxter, Head of the Tree of Life Programme, Wellcome Sanger Institute 06:18 Dr Tom Mathers, Senior Computer Biologist, Wellcome Sanger Institute 12:44 A word of thanks 18:44 A final thought from Mark Blaxter 22:57 Outro

    Hi-C contact map of the common crane (Grus grus)

    Hi-C contact map showing the common crane genome (https://wellcomeopenresearch.org/articles/10-119/v1) after manual curation. Each block represents a chromosome in order of size from left to right and top to bottom, with dark red cluster in the bottom right hand corner showing unplaced repetitive content.

    Resources

    If there's a topic you'd like to hear on a future podcast, or if you'd like to share your thoughts, email the ZSL Wild Science Podcast at: wild.science@zsl.org Check out our science and conservation work at: www.zsl.org/Science or www.zsl.org/conservation Darwin Tree of Life project: https://www.zsl.org/what-we-do/projects/darwin-tree-life-project Dr Ava Jenkins: https://www.zsl.org/about-zsl/our-people/dr-ava-jenkins BTO ringing scheme: https://www.bto.org/get-involved/volunteer/projects/bird-ringing-scheme Bortoluzzi, C., Wright, C.J., Lee, S., Cousins, T., Genez, T.A.L., Thybert, D., Martin, F.J., Haggerty, L., The Darwin Tree of Life Project Consortium, Blaxter, M., Durbin, R. (2023) Lepidoptera genomics based on 88 chromosomal reference sequences informs population genetic parameters for conservation. Pre-print: https://www.biorxiv.org/content/10.1101/2023.04.14.536868v1.full.pdf

    Get in touch

    Email wild.science@zsl.org with your questions, comments, and thoughts for future episodes! Find us @ZSLScience on X or @zslofficial.bsky.social on BlueSky and use the hashtag #ZSLWildScience Follow us on Facebook @ZSLScienceAndConservation
    Fri, 27 Feb 2026 - 39min
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