‘He lay still in sleep, and they forgot that he was there, and flew down to find worms by pushing their long bills into the juggymire.’

Another Williamson word which doesn’t show up in the OED’s 600,000 word hoard.  I can only imagine it’s a dialect word for ‘quagmire’.  See also ‘sog’.

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. 128