‘Hearing them, an ackymal that had been searching the streamside hawthorn boughs for green caterpillars flittered to the islet and chittered beside the crackey.’
An alternative to ‘twitter’, ‘chirp’ or ‘chatter’. I liked Williamson’s combination of flittering and chittering. See also ‘stitter’ and ‘crackey, ackymal and ruddock’.
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. 62