The otters lay up near a cattle shippen, among reeds with white feathery tops. A dull red sun, without heat or rays, moved over them, sinking slowly down the sky. For two days and two nights the frosty vapour lay over the Burrows, and then came an icy north wind which poured like liquid glass from Exmoor and made all things distinct. The wind made whips of the dwarf willows, and hissed through clumps of the great sea-rushes. The spines of the marram grasses scratched wildly at the rushing air, which passed over the hollows where larks and linnets crouched from its invisible clutch. Like a spirit freed by the sun's ruin and levelling all things before a new creation the wind drove grains of sand against the legs and ruffled feathers of the little birds, as though it would breathe annihilation upon them, strip their frail bones of skin and flesh, and grind them until they became again that which was before the earth's old travail. Vainly the sharp and hard points of the marram grasses drew their circles on the sand: the Icicle Spirit was coming, and no terrestrial power could exorcise it. The north wind carried a strange thickset bird which drifted without feather sound over the dry bracken of Ferny Hill, where Tarka and Greymuzzle had gone for warmth. Its plumage was white, barred and spotted with dark brown. Its fierce eyes were ringed with yellow, the colour of the lichens on the stone shippens. Mile after mile its soft and silent wings had carried it, from a frozen land where the Northern Lights stared in stark perpetuity upon the ice-fields. The thick-set bird was an Arctic Owl, and its name was Bubu, which means Terrible. It quartered the mires and the burrows, and the gripe of its feathered feet was death to many ducks and rabbits. Clouds moved over land and sea with the heavy grey drifting silence of the ice-owl's flight; night came starless, loud with the wind's rue in the telegraph wires on the sea-wall. As Tarka and his mate were running down to meet the flood-tide in the pill, a baying broke out in the sky; whiskered heads lifted, fixed to harken. For a minute the otters did not move, while the hound-like baying passed over. The long skein of south-wending geese swung round into the wind, flying with slow flaps and forming a chevron that glided on down-held, hollow wings beyond the pill-mouth. Cries of golden plover, twined in the liquid bubble-link of the curlews' chain-songs, rose up from the saltings.