Birds that breed in Iceland overwinter in the British Isles; those from Central Europe overwinter as far south as Spain and North Africa; others migrate down to the Balkans, Turkey and Iraq for the winter.

Why do greylag geese migrate?

Anser anser

Wild Greylag Geese breed in the north, nesting on moorlands, in marshes, around lakes and on coastal islands. Wintering birds migrate south to semi-aquatic habitats, estuaries, marshes and flooded fields, feeding on grass and often consuming agricultural crops.

Are greylag geese native to UK?

The ancestor of most domestic geese, the greylag is the largest and bulkiest of the wild geese native to the UK and Europe. ... The native birds and wintering flocks found in Scotland retain the special appeal of truly wild geese.