Hedgehogs, despite being consistently voted the most beloved mammal in the United Kingdom, have suffered great population losses as industrial agriculture and other human impacts destroy their hedgerow habitats. Our latest guest, Hugh Warwick, has studied, celebrated, written about, and fought to protect hedgehogs for more than 30 years, leading a groundswell of local and individual action to protect the small animal. We spoke with Warwick about his role as the spokesperson for the British Hedgehog Preservation Society, his writings on the impact of manmade lines on the ability of wild animals to thrive, and the environmental importance of loving your hedgehog.

In “Beloved Beasts: Fighting for Life in an Age of Extinction,” science journalist Michelle Nijhuis chronicles the history of the wildlife conservation movement through the stories of the extraordinary people — both legendary experts and passionate amateurs — who shaped its evolution and expanding ambitions. Nijhuis introduces us to the Swedish scientists who devised the system of naming and grouping species that endures today, the rebel taxidermist who led the fight to save the American bison from extinction, the New York City socialite who demanded that the Audubon Society stop ignoring the gunning down of game birds by sportsmen, and more. These inspiring, dogged, and often flawed characters transformed both the ecological communities and ideas that we inherited. In this episode, we speak with Nijhuis about what we can learn from the stories of conservationists and their efforts to protect the wild animals that they loved, and the possibilities within a more equitable, inclusive fight to defend life.

In 1968, Dr. Bernie Krause was leading a booming music career. A prodigiously talented musician and early master of the electronic synthesizer, Krause was busy working with artists like the Doors and the Beach Boys and performing iconic effects for blockbuster films. Then Warner Brothers commissioned him to create an album incorporating the sounds of wild habitats, so he headed into Muir Woods with his recording equipment. What he heard changed his life and triggered a fifty-year odyssey.

Then and there, Krause decided that he wanted spend the rest of his life recording and archiving the music of wild animals and wild places. He quit Hollywood and began traveling the world. The soundscapes he recorded were full of epiphanies about the origin of our own culture and music, about the profound connectedness of creatures, and about the unseen tolls of human activity. Previous wildlife recordings isolated the calls of individual creatures, but Krause recorded habitats as a whole. He soon proposed a new theory of ecosystem functioning: that each species produces unique acoustic signatures, partitioning and occupying sonic niches such that the singing of all of the creatures in a healthy ecosystem can be heard, organized like players in an orchestra.

Today, Krause’s astonishing archive contains sounds made by more than 15,000 species. It is, as The New Yorker aptly put it, “an auditory Library of Alexandria for everything non-human.” Fifty percent of the recorded habitats no longer exist due to habitat destruction, climate change, and human din. We spoke with Krause about the beauty of and perils facing wild music, the extraordinary science of soundscape ecology, and how sound impacts the welfare of animals. The music in this episode is from Wild Sanctuary (www.wildsanctuary.com).

In the long months we’ve all been confined to our homes, many people have become reacquainted with the vibrant life just outside their doors, finding unexpected joy, companionship, and hope through partaking in the cycles of love and loss that happen in the skies and yards around us. It is this wonder to be found in the natural world, from observing the habits of the nesting chipmunk family under her house, to watching a monarch butterfly break out of its chrysalis, that our guest, Margaret Renkl, captures so evocatively through her writing. In her book, Late Migrations: A Natural History of Love and Loss, and in her weekly opinion columns for The New York Times, Renkl introduces readers to the profound joys and sorrows unfolding in the world around us. In stories about growing up in the South, the heartbreak of losing her parents, finding the perfect squirrel-proof finch feeder, and hearing the chattering of birds in her yard as they warn of a lurking snake, she grounds the extraordinary and uplifts the everyday. In this episode, we talk with Renkl about how loving nature and mourning it go hand in hand, how backyard nature can provide comfort during times of grief, the impetuousness of squirrels, and how she turned her Nashville backyard into a wildlife sanctuary.

Are plants intelligent? Can they think? Can they hear, see, feel, smell and taste? Throughout history, most Western philosophers and scientists answered those questions with a resounding “no.” Plants have long been treated as passive, inanimate objects that form the backdrop to our active lives, rather than highly sensitive organisms with intelligence and agency of their own. But on the cutting edge of modern science, this orthodoxy is being questioned by a group of daring and imaginative scientists — including our guest, Monica Gagliano — who think that plants are radically more sophisticated and sensitive than we’ve been giving them credit for. Gagliano pioneered the field of “plant bioacoustics,” the study of sounds produced by and affecting plants. The results of her groundbreaking experiments suggest that plants may perceive, solve problems, remember, and learn via mechanisms that differ from our own. In this episode, we speak with Gagliano about the profound implications of her discoveries and how listening to plants changed her understanding of the world.

In 2013, a sperm whale washed up dead on Spain’s southern coast. In its ruptured digestive tract, scientists found an entire flattened greenhouse that once grew wintertime tomatoes, complete with plastic tarps, hoses, two flower pots, and a spray canister. The whale also contained an ice cream tub, mattress parts, a carafe, and a coat hanger. And that was just the obvious human refuse. Our toxic chemicals build up in whale blubber over years such that the concentration of pollutants in some whale bodies now far exceeds that of the water surrounding them. In whales’ vastness, the reach of humanity’s destruction is magnified — but so too is the potential of our compassion. In her genius debut book, Fathoms: The World in the Whale, writer Rebecca Giggs asks: Who are we to whales? What does it mean to pollute not just places, but animals? What can understanding our ecological crises through the perspectives of other creatures teach us about ourselves? In this episode, we speak with Giggs about the astonishing ways in which whales and humans live in each other’s wakes and the enormous power of the world’s largest mammals to expand our own moral capacity.

As Dr. Joseph Drew Lanham writes in his beautiful and deeply moving memoir, The Home Place: Memoirs of a Colored Man’s Love Affair with Nature, from his earliest days growing up in the piedmont forests and fields of Edgefield, South Carolina, he dreamed of flight. This fascination with the aerial journeys of the blue jays that stole his grandmother’s pecans and the crows that invaded his father’s cornfield sparked Dr. Lanham’s lifelong dedication to studying birds and to exploring what it means to be a “rare bird” himself: a Black man in a field that is overwhelmingly white and an ecologist finding freedom through wildness on land where his ancestors were enslaved. In addition to advancing scientific understanding of wild animals, Dr. Lanham has written extensively about the deep and often overlooked connections between how we treat nature and how we treat our fellow humans. In this episode, we speak with Dr. Lanham about how bird lives and Black lives intertwine in the story of the Carolina Parakeet, the language-defying joy of watching swallow-tailed kites, and why Emily Dickinson was right in declaring that “hope is the thing with feathers.”

Born in Paris to an African-American GI and a French woman at the end of World War II, Dr. Daniel Pauly rose from a difficult and extraordinarily unusual childhood in Europe to become one of the most daring, productive, and influential fisheries scientists in the history of the field — and the first to illuminate the global extent and significance of overfishing. A professor and principal investigator of the Sea Around Us Project at the University of British Columbia, Dr. Pauly has devoted his career to studying and documenting the impact of fisheries on marine ecosystems and advocating for cutting-edge policies to address it. The software, scientific tools, and methods he and his research team developed have transformed understanding of how humans are impacting oceans. His research makes very clear that fish are in global peril — and so, in turn, are we. If our species manages to reverse course and avoid the “watery horror show,” as he calls it, for which we’re on track, it will be thanks in large part to his and his colleagues’ vision, courage, and decades of tireless work. In this episode, we speak with Dr. Pauly about the “toxic triad” that characterizes modern fisheries (catches are underreported, science is ignored, and the environment is blamed when fish populations collapse as a result), how “shifting baseline syndrome” — a term he coined — results in slow and inadequate responses to overfishing and climate change, why fish are shrinking and struggling to breathe as oceans warm, and why we need to end high seas fishing and government subsidies of international fishing fleets.

As wildlife across Canada face unprecedented pressures from climate change and industrial development, Indigenous Peoples, who have relied upon and managed these animals for millennia, are leading the way on ensuring their protection. From Newfoundland and Labrador to the Yukon Territory, groundbreaking Indigenous-led protection initiatives are ensuring Canada’s treasured species like the boreal caribou and globally important landscapes are safeguarded for future generations. In this episode, we speak with Indigenous Leadership Initiative (ILI) founder and director Valérie Courtois, an Innu forester who is a leading advocate for Indigenous-run guardianship and land protection across Canada. Courtois discusses the remarkable efforts of seven First Nations to pull caribou in the Ungava Peninsula back from the brink and her work empowering Indigenous peoples to manage and protect their ancestral lands.

Amid the systematic cruelties and alienating conditions which define our factory farm system, Farm Sanctuary stands out as an exemplar of human kindness. Over the past thirty years, Farm Sanctuary — co-founded and led by our guest, Gene Baur — has rescued thousands of farm animals from short, tortured lives in industrial confinement and allowed them to live out their days in comfort. There, these rescued cows, pigs, sheep and more serve as ambassadors, teaching millions of people — from schoolchildren to Hollywood stars — that farm animals are individuals with personalities and emotions and deserve to be treated as more than just widgets on an assembly line. In this episode, we speak with Baur about the origins and evolution of Farm Sanctuary, how animals who have suffered transform when they are treated with gentleness for the first time, and the globe wave of farm animal sanctuaries that his work inspired. From spur-of-the-moment calf rescues with celebrity supporters like Joaquin Phoenix to lawsuits against companies and government agencies, Baur has fought tirelessly to protect farm animals from cruelty and to promote a more compassionate world.