Bubbles blow and roll through Williamson’s prose, through the ebullition of both water and otters. Otters blow bubbles when they are happy and when they’re scared. See also another source of bubbles in this beautiful book.
‘The otters drifted on, round another bend until they came to where the smooth and thundering fall-over of the bubble-whitened water slanted across the river.’
Source: Henry Williamson, Tarka the Otter: His joyful water-life and death in the two rivers, illus. C.F. Tunnicliffe (Harmondsworth: Puffin Books, 1976 (1927)), p. 67