There's something about the movements of migratory animals that tugs at our emotions: we welcome their arrival on our shores and lament them leaving.
Matthew Parris - better known for his observation of the wildlife that prowls the lobbies of the House of Commons - explores the lives of five of nature's nomads and looks into their place in our culture.On dark spring evenings you can often see shadowy figures lurking on the banks of the River Wye near the Welsh border village of Llandogo.
They're the elvermen who, for generations have waited in anticipation of the tiny eels which make the two year journey from the Sargasso Sea to our rivers.
And if the elvermen have their way, the next stop is a frying pan.
This is one species that Matthew both meets - and eats!.