According to myth, cave wyrms are terrifying creatures that live deep inside mountain caves, or sometimes in marshes and fens ...

Although there are a few distinctive beasts that are place-specific, many ghosts, fairies, and goblins pop up in similar forms across the various Celtic mythologies.

All Creatures Great and Small is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet ...