A real rarity has surfaced on Youtube... This is a short film made by John Forrest for the National Film Board of Canada in 1994 on the natural history of corvids, Seven Crows a Secret. This film, long since out of print, is well known - but rarely seen - amongst Hughes scholars for featuring not only a fascinating interview with the artist Leonard Baskin discussing his art works about crows, but also one of the very few existing pieces of footage of Ted Hughes, in which he reads from his Crow poems and discusses the mythic history of the crow.
You can find the original VHS packaging and a teacher's guide to the film at the National Film Board of Canada's website.
Many thanks to Ann Skea (http://ann.skea.com/THHome.htm) for finding this wonderful resource.