Terrestrials is a family-friendly nature show hosted by Lulu Miller, built on the stranger facts of animal, plant and microbial life. Take Arctic squirrels. Out in the snow, Kelly describes the burrows beneath, which the squirrels line with moss, lichen and caribou fur before each one curls up alone for winter. Once under, they stop eating, stop dreaming and go eight months without pooping, and scientists in the 1960s played catch with them without waking a single one. That mix of solid fact and delighted disbelief is what the show does best. The subject range is wide. Titles run from 'The Greeting: Yo-Yo Ma's Humpback Whale Experiment' and 'The Red-Eyed Mascot: Loon Resilience in Minnesota' to 'The Snoozer: Penguin Slackerzzz Rule' and 'The Spellbook: Ancient Recipes for Animals', each fronted by a short nickname. Inside, the science goes further than the nicknames let on. At the bottom of a lake hole, microbes bob toward the light like a lava lamp, a habit linked to the ancient shift from six-hour days to twenty-four. A chinstrap penguin takes the microphone to defend napping as 'adaptive inactivity.' In the Yo-Yo Ma episode, a storyteller introduces Kanaloa, the Hawaiian deity who holds the oceans and their creatures, and adds that only about five percent of the sea has been explored. Humor does a lot of the work. A listener named Mo asks whether loons fart. Walter, who helps capture and band loons, admits he has never checked, then writes back after looking into it to report that they do not. The reply earns a pun about breaking wind. Listener questions also get their own closing stretch, The Badgers, where they go straight to the experts, cued by a chorus counting off 'me too, me three, me four.' Music is everywhere. Alan Goffinski, credited as The Songbud, is behind the original songs, which are also collected on Spotify. One closer insists 'you gotta yum your yuck,' and another dissolves into a chant about being a penguin at the big poopy club. The tone can soften as well: the Yo-Yo Ma episode ends on a quiet dedication. For classrooms, the team has built handouts, activities and discussion prompts with PBS Learning Media for grades K-8, available at radiolabforkids.org. A natural first stop is 'The Fuzzy Ruckus', the lichen episode Lulu names among her favorites, featuring the storyteller Ash and the magnifying glass Ash carries on hikes to inspect mosses and lichens. Episodes sign off with a promise to return in a couple spins of this dirty old planet, though the planet is sometimes lumpy and, in the episode about holes, holy.