Birds became the world's master musicians in order to convey to potential mates, rivals and predators all the important things they have to say, from "Clear off!" to "Come on!" And their songs ...

00 00 Listening to the chorus of the song, beginning: 'Birds of the North...' Joining in with the words 'Windward drifting...' 02 00 Learing about the importance of birds to the Vikings and ...

Odin and Heimdall watch from the battlements of Asgard as the birds approach. Odin orders Heimdall to make a bonfire then, when Loki and Iduna tumble through the smoke, Heimdall fans the flames.