Hold your horses for the latest episode of Boggart and Banshee. Simon and Chris gallop headlong into the world of horse spirits with headless ponies, phantom hoofbeats, and equine shape-changers, including the mischievous colt-pixie and the dread shag foal. But we're not just horsing around with were-horses. There are also serious questions to add to the neigh-rative. Why are spectral horses so often heard, but not seen? Why are trickster spirits frequently spotted in equine form? And why, on earth, do horse spirits on both sides of the Atlantic insist on coming into houses and up the stairs? A source book has been published for this epiosde:  S. R. Young, Haunting Horses: Equine Ghosts, Portents and Shapechangers from Britain, Ireland and World Folklore