The Ealing Beaver Project has found success as two new beaver kits have been born in a park in London after being reintroduced last October.
Marnie visits the site to learn more about the benefits they bring - but beavers are just a drop in the river of urban rewilding. We find out what the practicalities and pitfalls of letting nature take back space in our cities are.
Do you feel like your dog is watching you? You're probably right. Zoologist and broadcaster Jules Howard ponders on the human-watching acuity of our beloved pets.
And our guts are not the only places where bacterial communities thrive, new research tells us that our microwaves also have a microbiome. Should we be worried?
Presenter: Marnie Chesterton Producers: Ella Hubber, Sophie Ormiston and Gerry Holt Editor: Martin Smith Production Co-ordinators: Jana Bennett-Holesworth and Andrew Rhys Lewis