While the eels were migrating the otters found their food easily, as there was no hunting to be done. They followed the eels down the river, eating them tail-first as far as the vent, and leaving the head and paired fins. They played away most of the night. The mother took her cubs to a steep sloping bank of clay which had been worn in past winters by many otters sliding down it. Nine feet below was a pot-hole with seven bubbles turning in the centre with a stick, and as Tarka slid down headfirst he meant to seize the stick and play with it. When he looked up through the water it was gone, and many other bubbles rode there, a silver cluster about the blurred image of another otter. Hearing the strokes of an otter's rudder he looked in the direction of the sound, and saw a strange cub, with the stick in its mouth, travelling under the foamy current. Tarka followed the dim form until he reached a barrier made by an uprooted pollard willow and broken branches lodged in the stream. He climbed on the trunk, shaking water from his ears and eyes, and ran back with jubilant whistles to the slide. There he saw the cub, the stick still in its mouth, standing with a grown otter. Tarka yikkered, and ran back to the water. The grown otter mewed to him, ran after him, licked his face, and purred in his ear. He tissed at her, and whistled to his mother, who came to him, but did not drive the stranger or the cub away. The stranger had been the mother of many litters long before Tarka's mother had been born. Her fur was grizzled on pate and shoulders, and her muzzle was grey. Her canine teeth were long and yellow, and she had lost three of her incisors. She knew every river and stream that flowed north into the Severn Sea. She had roamed the high cold moors of three counties, and had been hunted by four packs of otter hounds. Her name was Greymuzzle. She played with the otters at the slide, and remained with them when the low clouds became rosy in the east. That day all five hovered on Leaning Willow Island, and she curled beside Tarka, and washed his fur, treating him as though he were her own cub. Then she washed the other cub, who had a white-tipped rudder. Greymuzzle had met White-tip wandering alone three weeks before, and had remained with her ever since. There was friendship and sympathy between the two grown otters, for they never yikkered or tissed at each other. Indeed, although Tarka's mother did not remember Greymuzzle, the old otter had played with her and her cub brothers all one night in one of the duckponds near the estuary.